YOUR GUIDE FOR Environmental
Sampling and Analysis

Backed by a long history of supporting environmental labs, Restek's high-performance chromatography supplies and world-class
technical service equip you to achieve:

  • Faster throughput and lower cost per sample.
  • Accurate, reliable, and legally defensible data.
  • Hassle-free compliance with method requirements.

Life in an environmental testing lab can be incredibly stressful, and the hours brutally long. Rework, a down instrument, data errors, cost overruns... when you face a growing backlog of samples with expiring hold times, even the smallest snag is another roadblock between you and your evening’s plans. That’s where Restek comes in.

Think of Us as Your Trail Guide...

..through the complex matrices and chromatographic methods of the environmental testing landscape. Restek has devoted over 30 years to environmental chromatography, particularly in supporting laboratories who analyze volatile organic compounds (VOCs) and extractable organic compounds (EOCs or semivolatiles) in water, soil, air, and waste materials. In fact, many of our in-house experts cut their chromatographic teeth in environmental labs just like yours, so we know what struggles you face—and how to help you solve them.

Performance-Based Products for Your Environmental Lab


Our high-performance, industry-proven LC and GC columns and sample preparation products, many tailored specifically for environmental chromatography methods, will help you reliably attain accurate and legally defensible data with faster turnaround and lower cost per sample.


Over 97.5% of the Restek-manufactured reference standards in our catalog are certified reference materials (CRMs) that will help you more easily meet EPA, EN, and other regulatory requirements.


As an independent company, we develop LC and GC accessories that can improve the performance and decrease the downtime of any make or model of instrument in your lab.


And, we are one of only two companies in the industry that manufactures our own air sampling canisters—durable, leak-free RAVE valves are featured on our full line of TO-Can, SilcoCan, and miniature air sampling canisters.

Your First and Best Choice
for Environmental Supplies Plus...


Our experienced Technical Service group specializes in providing information about Restek products, applications, troubleshooting, method development, and more. For free, fast, personalized, and thorough answers to your most challenging technical questions, contact Restek Technical Service today.


Especially for high-throughput environmental labs, our standing orders (also known as blanket orders) provide a convenient way to significantly lower costs and ensure timely delivery of business-critical LC and GC consumables and reference standards. Contact your local Restek representative inside the U.S. or outside the U.S. to discuss delivery and purchase options as well as to request literature, get a personal consultation or product demonstration, arrange on-site training, and more.


Looking for the latest news and discussion on environmental sampling and analysis? Look no further than ChromaBLOGraphy. Restek’s blog is where we share our thoughts on current trends in chromatography, best practices, and troubleshooting tips. Best of all, you can weigh in yourself.

Making a Difference
One Chromatogram at a Time

In the end, a successful LC or GC environmental analysis doesn’t just help you, your lab, and your customers; it helps protect the planet and improve public health. Contact Restek today, and, together, we can make a difference—and get you out the door early enough to enjoy the world you are working so hard to defend.

in Soil and Water


If you're in an environmental lab analyzing soil or water samples for extractable organic compounds (EOCs or semivolatiles), check out these featured resources. Looking for more information? Check out the Resources tab above.

Accurately Quantify 380 Pesticides by LC-MS/MS and GC-MS/MS   Read Now

Helium, Hydrogen, or Nitrogen—The Choice is Yours: Optimal Results for Organochlorine Pesticides GC-Micro-ECD Analysis Using Any Carrier Gas
Read Now

Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water
Read Now

Improve GC Analysis of Extractable Petroleum Hydrocarbons   Read Now

Increase Productivity for Dioxin and Furan Analysis   Read Now

Accurately Quantify PAHs Down to 5 pg On-Column with GC/MS SIM Analysis   Read Now

Resolve Important Isobaric Polycyclic Aromatic Hydrocarbons for Environmental Methods   Read Now

Analyze Carbamate Pesticides in a Fraction of the Time and Boost Productivity   Read Now

4-Minute Bisphenol A (BPA) Analysis Increases Sample Throughput
Read Now

Fast Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) by HPLC-UV
Read Now

Seven EPA Methods on One Column Pair Using a micro-ECD; Analyze Pesticides, PCBs, Herbicides and More
Read Now

Half the Column, Same Chromatogram: Maintain Resolution of BDE 49 and BDE 71 with Proper Method Translation After Trimming for Maintenance   Read Now

Rapid Perfluorinated Alkyl Acid Analysis by LC-MS/MS Increases Sample Throughput   Read Now

Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography   Read Now


Rtx-CLPesticides Columns (fused silica)

proprietary Crossbond phase

  • Application-specific columns for organochlorine pesticides and herbicides.
  • Low bleed—ideal for high sensitivity GC-ECD or GC-MS analyses.
  • Baseline separations in less than 10 minutes.
  • Stable to 320–340 °C.
  • Analyze EPA Method 8081B, 8082A, 8151A, 504.1, 515, 508.1, and 552.2 compounds without time-consuming column changes.

Rtx-CLPesticides2 Columns (fused silica)

proprietary Crossbond phase

  • Application-specific columns for organochlorine pesticides and herbicides.
  • Low bleed—ideal for high sensitivity GC-ECD or GC-MS analyses.
  • Baseline separations in less than 10 minutes.
  • Stable to 320–340 °C.
  • Analyze EPA Method 8081B, 8082A, 8151A, 504.1, 515, 508.1, and 552.2 compounds without time-consuming column changes.

Intermediate-Polarity Deactivated Guard/Retention Gap Columns/Transfer Lines (fused silica)

  • Tested with a comprehensive test mix to ensure high inertness.
  • Useful for a wide range of applications.
  • Use with most common solvents.
  • Maximum temperature: 325 °C.

Rxi-5ms Columns (fused silica)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

  • General-purpose columns for semivolatiles, phenols, amines, residual solvents, drugs of abuse, pesticides, PCB congeners (e.g., Aroclor mixes), solvent impurities.
  • Most inert column on the market.
  • Tested and guaranteed for ultra-low bleed; improved signal-to-noise ratio for better sensitivity and mass spectral integrity.
  • Temperature range: -60 °C to 330/350 °C.
  • Equivalent to USP G27 and G36 phases.

Rxi-5Sil MS Columns (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

  • Engineered to be a low-bleed GC-MS column.
  • Excellent inertness for active compounds.
  • General-purpose columns—ideal for GC-MS analysis of semivolatiles, polycyclic aromatic compounds, chlorinated hydrocarbons, phthalates, phenols, amines, organochlorine pesticides, organophosphorus pesticides, drugs, solvent impurities, and hydrocarbons.
  • Temperature range: -60 °C to 350 °C.
  • Some dimensions also available as Integra-Guard columns — a guard and analytical column in one to eliminate connection problems!

Rxi Guard/Retention Gap Columns (fused silica)

  • Extend column lifetime.
  • Excellent inertness—obtain lower detection limits for active compounds.
  • Sharper chromatographic peaks by utilizing retention gap technology.
  • Maximum temperature: 360 °C.

Rtx-5 (G27) Columns (fused silica)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

  • General-purpose columns for drugs, solvent impurities, pesticides, hydrocarbons, PCB congeners (e.g., Aroclor mixes), essential oils, semivolatiles.
  • Equivalent to USP G27 and G36 phases.
  • Some dimensions also available as Integra-Guard columns — a guard and analytical column in one to eliminate connection problems!

Rtx-VMS Columns (fused silica)

proprietary Crossbond phase

  • Application-specific columns for analyzing volatile organic pollutants by GC-MS including Methods TO-15, TMS, and EPA 8260.
  • Complete separation of U.S. EPA Method 8260 compounds in less than 10 minutes.
  • Stable to 260 °C.
  • No known equivalent phases.

Rxi-624Sil MS Columns (fused silica)

midpolarity Crossbond phase

  • Low-bleed, high-thermal stability column—maximum temperatures up to 300–320 °C.
  • Inert—excellent peak shape for a wide range of compounds.
  • Selective—G43 phase highly selective for volatile organics and residual solvents, great choice for USP<467>.
  • Manufactured for column-to-column reproducibility—well suited for validated methods.

Pinnacle II PAH HPLC Columns

Particle: 4 µm, spherical
Pore Size: 110 Å
Carbon Load: proprietary
End-Cap: no
Surface Area: 180 m2/g
pH Range: 2.5 to 8
Maximum Temperature: 80 °C

Raptor C18 LC Columns (USP L1)

  • A traditional end-capped C18 ideal for general-purpose use in reversed-phase chromatography.
  • Wide pH range (2–8) provides excellent data quality for many applications, matrices, and compounds.
  • Offers the highest hydrophobic retention of any Raptor phase.
  • Part of Restek’s Raptor LC column line featuring 1.8, 2.7, and 5 µm SPP core-shell silica.

Raptor ARC-18 LC Columns (USP L1)

  • Ideal for high-throughput LC-MS/MS applications with minimal sample preparation.
  • Well-balanced retention profile for better detection and integration of large, multiclass analyte lists.
  • Sterically protected to endure low-pH mobile phases without sacrificing retention or peak quality.
  • Part of Restek’s Raptor LC column line featuring 1.8, 2.7, and 5 µm SPP core-shell silica.

Raptor EXP Guard Column Cartridges

  • Free-Turn architecture lets you change cartridges by hand without breaking inlet/outlet fluid connections—no tools needed.
  • Patented titanium hybrid ferrules can be installed repeatedly without compromising high-pressure seal.
  • Auto-adjusting design provides ZDV (zero dead volume) connection to any 10-32 female port.
  • Guard column cartridges require EXP direct connect holder (cat.# 25808).
  • Pair with EXP hand-tight fitting (cat.# 25937–25938) for tool-free installation.

Ultra Carbamate Columns

Particle: 3 µm or 5 µm, spherical
Pore Size: 100 Å
Carbon Load: proprietary
Surface Area: 300 m2/g
pH Range: 2.5 to 8
Maximum Temperature: 80 °C

Ultra Aqueous C18 Columns (USP L1)

Stationary Phase Category: modified C18 (L1)
Ligand Type: proprietary polar modified and functionally bonded C18
Particle: 3 µm or 5 µm, spherical
Pore Size: 100 Å
Carbon Load: 15%
End-Cap: no
Surface Area: 300 m2/g
pH Range: 2.5 to 8
Maximum Temperature: 80 °C

Ultra Guard Cartridges

Particle size: 5 µm spherical
Pore size: 100 Å

For a detailed description of the stationary phase in this guard cartridge, see the product page for an analytical column with the same silica and stationary phase (e.g., Ultra C18).

Rtx-Dioxin2 Columns (fused silica)

proprietary Crossbond phase

  • Isomer specificity for 2,3,7,8-TCDD and 2,3,7,8-TCDF achieved with one GC column.
  • Thermally stable to 340 °C for longer lifetime.
  • Unique selectivity for toxic dioxin and furan congeners allows use as a confirmation GC column.

Rtx-1614 Columns (fused silica)

5% diphenyl, 95% dimethyl polysiloxane

  • Optimized for PBDE analysis by EPA Method 1614.
  • Short column option resolves BDE-209 3 times faster, with less thermal breakdown.
  • Unique deactivation gives higher BDE-209 response than competitor columns, for greater analytical sensitivity.
  • Exceeds EPA Method 1614 resolution criteria for BDE-49 and BDE-71.
  • Stable to 360 °C.

Rxi-XLB Columns (fused silica)

low-polarity proprietary phase

  • General-purpose columns exhibiting extremely low bleed. Ideal for many GC-MS applications, including pesticides, PCB congeners (e.g., Aroclor mixes), PAHs.
  • Unique selectivity.
  • Temperature range: 30 °C to 360 °C.

Rxi-PAH Columns (fused silica)

midpolarity proprietary phase

  • Ideal for EFSA PAH4 analysis—separates all priority compounds: benz[a]anthracene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene.
  • Best resolution of chrysene from interfering PAHs, triphenylene, and cyclopenta[cd]pyrene.
  • Complete separation of benzo [b], [k], [ j], and [a] fluoranthenes.
  • 360 °C thermal stability allows analysis of low-volatility dibenzo pyrenes.

Reference Standards

GC Multiresidue Pesticide Kit

  • Accurately identify and quantify pesticide residues by GC-MS/MS in fruits, vegetables, botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.
  • Comprehensive 203-compound kit covers food safety lists by the FDA, USDA, and other global governmental agencies; individual ampuls also sold separately.

LC Multiresidue Pesticide Kit

  • Accurately detect and quantify pesticides of global food safety concern in a wide range of fruits, vegetables, and other commodities by LC-MS/MS.
  • Full kit contains 204 compounds of interest, covering many LC-determined pesticides listed by government agencies; individual ampuls also sold separately.

Aroclor Solutions

  • Aroclor standards may exhibit lot-to-lot variation.

Sample Handling

Canisters and Accessories

SilcoCan and TO-Can air sampling canisters with RAVE valve, passive air sampling kits, gauges, valves, flow controllers, and much more.

Gas Sampling Bags

Multi-layer, ALTEF, and Tedlar sampling bags; vacuum bag samplers; replacement parts; and syringes.

Thermal Desorption (TD) Products

Thermal desorption (TD) tubes in a variety of styles, grab samplers, multiple tube sequential samplers, sampling pumps, and accessories.

Method Specific SPE Cartridges

These cartridges have been specifically designed to provide consistent and reproducible results for the method or application stated.

Resprep Florisil SPE Cartridges (Normal-Phase mode)

  • High-quality, silica-based hydrophilic adsorbents.
  • Used to extract hydrophilic analytes from nonpolar matrices, such as organic solvents (e.g., polar contaminants from sample extracts).

Resprep CarboPrep SPE Cartridges

  • Improved recovery of sulfonylurea herbicides, phenols, carbamates, and triazine herbicides, compared to C18 and C8 cartridges.
  • Wide range of selectivity for both analytes and their metabolites or degradation products.
  • Rapid sampling flow rates; uncompromised recoveries.
  • Maximum capacity for contaminant cleanup.
  • Controlled manufacturing improves cleanliness and ensures reproducible performance.
  • Excellent performance removing pigments from samples.

Pesticide Residue Cleanup SPE Cartridges

  • Convenient, multiple adsorbent beds in a single cartridge.
  • For use in multiresidue pesticide analysis to remove matrix interferences.
  • Excellent for cleanup of dietary supplement extracts.

ASE Extraction System Supplies

Cells, replacement parts, tools, and accessories for ASE extraction systems.

Canister Cleaning System

The TO-Clean Canister Cleaning System plus accessories and optional humidification chamber.

CarboPrep Reversing SPE Cartridges

  • High adsorbent capacity (surface area ~200 m2/g) for large volume sampling.
  • Chromatographic grade graphitized carbon provides consistent and quantitative recoveries of a wide variety of semivolatiles, pesticides, and herbicides.
  • 500 mg bed weight.

Resprep Closed End SPE Cartridge: Activated Sodium Sulfate

  • High quality anhydrous sodium sulfate.
  • Approximately 2 grams prepackaged in a convenient capped cartridge with both male and female luer ends for easy connection to a variety of devices or equipment.
  • The adsorbent is fully activated and ready to use for removal of excess water from organic solvent solutions, prior to many types of analysis.
  • Capped cartridges will remain active for long periods of storage in the lab.

Resprep C18 SPE Cartridges (Reverse-Phase mode)

  • High-quality, silica-based hydrophobic adsorbents.
  • Used to extract hydrophobic analytes from polar matrices, such as water (e.g., pesticides from water).
  • Stable over the pH range (2 – 8).
  • All cartridges are end-capped.

Bulk Adsorbents

Bulk solid phase extraction (SPE) adsorbents, including Florisil PR, diatomaceous earth, Ottawa sand, granulated activated copper, and sodium sulfate.


Resprep SPE disks.

Manifolds and Replacement Parts

Resprep SPE manifolds and lids, sample delivery systems, and replacement parts; oil-free vacuum/pressure stations; vacuum tubing.

Sample Filtration

Syringe filters, Thomson SINGLE StEP filter vials, and accessories.

PUF and XAD Resin Sampling

Ultra-clean XAD-2-equivalent resin; cleaned polyurethane foam (PUF) cartridges, holders, and plugs; SDVB resin.

Gas Sampling Valves & Loops

Add gas sampling valves and loops, replacement rotors, syringes, and syringe O-rings to your order for convenient one-stop shopping.

Supplies & Accessories

Restek ProFLOW 6000 Electronic Flowmeter

Flowmeters that can measure flammable gases are becoming mandatory due to the increased use of hydrogen in chromatography. With its Ex rating, the Restek ProFLOW 6000 meter is designed specifically with explosive and flammable gases in mind.

The Restek ProFLOW 6000 is the only flowmeter you need for any type of chromatography gas measurement because of its wide range of capabilities. The ProFLOW 6000 is an electronic meter capable of measuring volumetric flow for most gases. Real-time measurements can be made for various types of flow paths, including continually changing gas types. This portable unit is designed for easy handheld use, and the stand adds benchtop convenience.

Restek Electronic Leak Detector

New and improved! Prevent small leaks from causing big problems with a Restek leak detector.

  • Detects a broad range of gases and indicates leak severity with both an LED display and audible tone.
  • No more waiting for a full charge—can be operated during charging or used up to 12 hours between charges.
  • Charging kit includes both universal AC power adaptor and USB charging cable so you can charge anywhere, anytime.
  • Pinpoint very small gas leaks quickly and accurately before they cause damage and downtime.
  • Compact, handheld unit is easy to operate and convenient to use anywhere you need to check for leaks.

Inlet Liners and Liner Supplies

Restek's huge selection of GC inlet liners; choose by instrument manufacturer, deactivation, configuration and style, or material.


Premium non-stick BTO, Thermolite, Merlin Microseal, and standard septa for all common makes and models of instrument.

Column Connectors

Our wide variety of GC column connectors features universal Press-Tight, defined PressFit, and permanent SilTite µ-union connectors among many other options.


Standard and specialty ferrules for a range of instruments, column connectors, and material needs.

Other Inlet Supplies

Inlet seals, inlet maintenance kits, tools, gauges, nuts, O-rings, regulators, and much more.

Gas Generators

Featuring Parker Balston hydrogen, nitrogen, zero air, and other generators as well as maintenance kits.

Gas Purification

Filters and traps to remove hydrocarbons, moisture, and oxygen from carrier and FID gas; connectors; S-traps; and accessories. 

GC Fittings

Fitting kits, nuts, tees, unions, plugs, reducers, connectors, and other hardware needed for your GC in stainless steel, brass, and Siltek/Sulfinert or Silcosteel-CR treatment


Autosampler and manual syringes as well as replacement needles, plungers, and O-rings

Purge-and-Trap Supplies

Spargers, syringes, by-pass lines, VOA sampling vials, and injection port weldments for purge-and-trap instruments.

Vials and Plates

Vials, caps and septa, inserts, racks, and well plates for your entire lab.

Detector Supplies

EI filaments; ETP electron multipliers; nuts, connectors, and fittings; pump oil; ECD make-up gas kits; tools; weldments.... If you need it for your detector, it's right here.

Autosampler Replacement Parts

Rinse/waste vials, belts, injector turret motors, turret tray assemblies, and injector posts.

Maintenance Supplies for Capillary Columns

Scoring wafers and cutters, column caps, high-temp string, hangers, rinsing reservoirs, and other products for capillary column maintenance.


Filter by copper, instrument-grade stainless steel, or passivated stainless steel, and find accessories like cutting tools and tubing benders.

Ultra High Purity Regulators

Single-stage, dual-stage, and in-line gas regulators, switchover systems, protocol stations, and accessories.



Increase Sample Throughput for Organochlorine Pesticides Analysis with Improved Cleanup and Accelerated Analytical Conditions

Organochlorine pesticides analysis is more efficient using this approach, which pairs a more effective sample extract cleanup with faster analytical conditions.


Featured Application: Glyphosate on Raptor Polar X - Simple Large Volume Injection Method for Trace-Level Glyphosate in Bottled Drinking Water

Trace-level detection of glyphosate can be achieved without complex derivatization or ion-pairing by using direct large volume injection of water on a Raptor Polar X column.


LC-MS/MS Analysis of Acrylamide in Drinking Water Using Large Volume Injection

In this work, we share a method for the analysis of acrylamide in drinking water at low ppt levels using large volume injections directly into an LC-MS/MS.


Rtx-Wax: A Rugged and Reliable Choice for the Analysis of Glycols in Water

Three types of polyethylene glycol (PEG) columns from different vendors were evaluated to determine which performed best for the analysis of glycols in water. The columns were first challenged with exposure to 600 aqueous injections and then linearity, lifetime, and bleed were assessed. Rtx-Wax columns performed well throughout the test and were the only columns that passed all tests.


Integrating the Analysis of Ultrashort-Chain PFAS - Method Development for Simultaneous Analysis of Ultrashort-Chain, Alternative, and Legacy PFAS

A simple dilute-and-shoot method was developed and validated for the LC-MS/MS analysis of ultrashort-chain PFAS simultaneously with alternative and legacy PFAS in various water samples. This method is recommended for analytical labs wanting to use a single method to analyze compounds from all three PFAS categories in potable and non-potable waters.


Improve EPH Testing Accuracy and Efficiency with Resprep EPH Fractionation SPE Cartridges

New and improved Resprep EPH fractionation SPE cartridges from Restek completely separate aliphatic and aromatic compounds, and they are guaranteed to produce background levels that are below the strict reporting limits of MA and NJ EPH methods. Superior lot-to-lot reproducibility and storage stability mean every lot will perform the same as the lot before it.


Eliminate the Impact of Instrument-Related PFAS Interferences by Using a Delay Column

Using a PFAS delay column is an effective way to separate target PFAS in samples from interferences caused by PFAS contamination in the LC system. This article explains how the PFAS delay column can improve trace-level PFAS analysis by removing the impact of system-related interferences.


Featured Application: Paraquat and Diquat on Raptor HILIC-Si - LC-MS/MS Analysis of Paraquat and Diquat without Ion-Pairing Reagents

LC-MS/MS analysis of paraquat and diquat herbicides is an important tool for protecting human and environmental health. However, the ion-pairing reagents that are commonly used to improve retention, resolution, and peak shape have a negative impact on sensitivity and can contaminate the system necessitating frequent cleaning. The LC-MS/MS analysis of paraquat and diquat presented here provides complete separation and good peak response for both target analytes in a fast, 7-minute gradient run without the use of troublesome ion pairing reagents.


Featured Application: Extractable Semivolatile Organic Compounds on Rxi-5Sil MS - Analyze More Semivolatile Samples per Shift Using Split Injection and an Rxi-5Sil MS Column

Sample throughput for semivolatiles analysis can be significantly increased by employing split injection instead of splitless injection. Split injection allows more samples to be analyzed per shift because it utilizes a higher initial GC oven temperature and faster oven cycle time. Pairing a robust Rxi-5Sil MS column with split injection ensures fast, accurate results for analyzing semivolatiles under procedures such as Method 8270.


Analysis of Trace Oxygenates in Petroleum-Contaminated Wastewater, Using Purge-and-Trap GC-MS (U.S. EPA Methods 5030B & 8260)

Determination of oxygenates in a gasoline-water matrix is difficult because analytes such as MTBE and TBA coelute on many columns and share GC-MS identification ions. We developed a sensitive, accurate analysis using an Rtx-VMS column and optimized conditions.


Rapidly Analyze a Wide Range of Glycol Ethers by GC-MS Using the New Rxi-1301Sil MS Column

Chromatographic conditions were developed for a fast GC-MS glycol ether analysis on the Rxi-1301Sil MS column. This column provides better resolution and faster run times than the thick film cyanopropylphenyl-type columns commonly used for speciation of the glycol ethers.


Optimized Volatiles Analysis Ensures Fast VOC Separations

Analytical conditions for GC analysis of volatile organic compounds have been optimized to ensure good resolution of critical pairs, while maximizing sample throughput. Rxi-624Sil MS columns are shown to outperform other 624s.

Air Sampling

Featured Application: Aldehydes and Ketones in Air Samples on Raptor ARC-18 and C18 LC Columns - Improve Analysis of Aldehydes and Ketones in Air Samples with Faster, More Accurate Methodology

To help labs improve analytical speed and accuracy, Restek has developed LC columns and instrument conditions that reliably provide baseline separation of commonly analyzed DNPH derivatives of aldehydes and ketones in air samples in just minutes. Using these products and procedures assures fast, accurate determination of aldehydes and ketones in air and offers an opportunity for improved sample throughput compared to typical methods.

Air Sampling

Storage Stability of 66 Volatile Organic Compounds (VOCs) in Silicon-Lined Air Canisters for 30 Days

The recoveries of 66 volatile organic compounds (VOCs) typically analyzed as part of the EPA Method TO-15 were evaluated for two commercially available silicon-lined (SL) air canisters. For the majority of the 66 VOCs, there were no appreciable differences in recoveries and stabilities between the canisters for both dry and humid conditions over 30 days of storage. Acrolein, dibromochloromethane, and bromoform were the only three compounds that appear to be unstable in both SL canister types; however, only under the humid (93% RH) condition.

Air Sampling

Optimize Analysis of Polar and Coeluting VOCs in Whole Air Canister Samples Using an Rtx-VMS GC Column

Since Method TO-15 is a performance-based method for analyzing VOCs in whole air canister samples, labs have the option to use any GC column that meets performance criteria. Shorter columns can be used to reduce analysis times and stationary phases that separate difficult coelutions can be selected. After evaluation of a wide variety of columns, the Rtx-VMS column offers the best overall performance and is particularly recommended when polar or coeluting compounds are included in the list of target analytes.


Rapid Determination of TO-15 Volatile Organic Compounds (VOCs) in Air

The efficacy of using a Nutech preconcentrator and a 30 m analytical column for VOC analysis of air samples according to Method TO-15 was evaluated. Results demonstrate that method criteria were easily met and in much faster analysis times than typical methods based on 60 m columns.


Helium, Hydrogen, or Nitrogen—The Choice is Yours: Unique Rtx-CLPesticides Column Set Provides Optimal Results for Organochlorine Pesticides GC-Micro-ECD Analysis Using Any Carrier Gas

Using an Rtx-CLPesticides column set is the best strategy for labs considering alternate carrier gases as a way to reduce helium consumption. These columns have a unique selectivity and produce faster results than competitor columns when using either helium or hydrogen. In addition, only Rtx-CLPesticides columns can be used with nitrogen, which give labs the freedom to choose the carrier gas option that is best for them.


Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water - Using a Single SPE Cartridge and Concurrent Solvent Recondensation–Large Volume Splitless Injection (CSR-LVSI) with EI GC-MS

Typically, 1,4-dioxane and nitrosamines are analyzed in drinking water following separate extraction and analysis procedures, such as Methods 521 and 522. However, here we present a combined method that uses large volume splitless injection and GC-MS (SIM) to meet low part-per-trillion detection limits for these compounds in a fraction of the time required when running separate methods.


Accurately Quantify PAHs Down to 5 pg On-Column - GC/MS SIM Analysis with the Rxi-5Sil MS Column

Semivolatiles methods, such as EPA Method 8270, place stringent demands on gas chromatography (GC) columns. Here we demonstrate the performance of Rxi-5Sil MS columns for semivolatiles analysis in terms of bleed, efficiency, and activity. Excellent sensitivity and resolution are seen, even for difficult PAHs such as benzo(b)fluoranthene & benzo(k)fluoranthene, and indeno(1,2,3-cd)pyrene and dibenzo(a,h)anthracene. Both basic and acidic compounds show good response even at low levels.


Featured Application: Carbamate Pesticides on an Ultra Carbamate LC Column - Analyze Carbamate Pesticides in a Fraction of the Time and Boost Productivity

Carbamate pesticides can be analyzed much faster on an Ultra Carbamate LC column than on a C18 column. Whether using UV, fluorescence, or LC-MS detection, labs can achieve accurate carbamate determinations in just 5–10 minutes using an Ultra Carbamate column and certified reference materials from Restek.


Featured Application: Fast Analysis of Bisphenol A on a Raptor Biphenyl LC Column - 4-Minute Bisphenol A (BPA) Analysis Increases Sample Throughput

A Raptor Biphenyl column is a better choice for BPA analysis than a conventional C18 column. On a Raptor Biphenyl column, narrow, symmetrical bisphenol A peaks elute in less than 2 minutes, providing a fast and selective means to isolate and quantitate bisphenol A by LC-MS/MS.


Featured Application: Polycyclic Aromatic Hydrocarbons (PAHs) on a Pinnacle II PAH HPLC Column - Fast Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) by HPLC-UV

Pinnacle II PAH columns were developed by Restek as an alternative to C18 columns specifically for the analysis of PAHs by HPLC. These reliable columns provide baseline resolution of key PAHs in a fast ~15 minute analysis without the expense of UHPLC equipment.


Half the Column, Same Chromatogram: Maintain Resolution of BDE 49 and BDE 71 with Proper Method Translation After Trimming an Rtx-1614 Column for Maintenance

Column trimming can extend GC column lifetime when analyzing polybrominated diphenyl ethers (PBDEs); however, the method must be adapted to the shorter column length in order to maintain separation of critical congeners. Here we demonstrate that with proper method translation an Rtx-1614 GC column can be trimmed nearly in half and still meet resolution requirements for BDE 49 and BDE 71.


Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography

Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used to analyze petroleum biomarkers creating unique fingerprints of crude oil samples and tarballs collected after the Deepwater Horizon oil spill.


Featured Application: Optimized Volatiles Analysis on an Rtx-VMS Column with Restek CRMs Means Better VOC Data in Less Time - Fast, Optimized GC Purge-and-Trap Analysis of Volatiles for Soil and Water Methods

Restek’s Rtx-VMS column and certified reference materials (CRMs) are highly effective tools optimized for GC purge-and-trap analysis of volatiles. The unique column phase provides the best separation of critical compounds available on the market. In addition, our comprehensive CRMs are manufactured and QC-tested in our ISO-accredited labs to assure quality and make your job easier.

PDF Document

Increase Productivity for Dioxin and Furan Analysis with Rtx-Dioxin2 GC Columns

Rtx-Dioxin2 columns have higher temperature stability (340 °C) than other confirmation columns and also provide isomer specificity for both 2,3,7,8-TCDD and 2,3,7,8-TCDF in a single column. These attributes allowed the Maxxam Analytics HR-MS group to make productivity improvements that resulted their being honored with a Kaizen award. (PDF - 0MB)

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New Rxi-PAH GC Column; Resolve Important Isobaric Polycyclic Aromatic Hydrocarbons for Food Safety and Environmental Methods

Separate isobaric polycyclic aromatic hydrocarbons, including priority EFSA PAH4 compounds benz[a]anthracene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene, easily and accurately on an Rxi-PAH column. Whether you need more resolution or faster analysis, these new GC columns offer the selectivity and efficiency you need for food safety and environmental PAH analysis. (PDF - 0MB)

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Improve GC Analysis of Extractable Petroleum Hydrocarbons Using Resprep EPH Fractionation SPE Cartridges

New manufacturing and testing procedures for Resprep EPH fractionation SPE cartridges reduce background levels of extractable contaminants and assure more reliable fractionation of aliphatics from aromatics. (PDF - 0MB)

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Analyze Seven EPA Methods on One GC Column Pair! Pesticides, PCBs, Herbicides, and More on Rtx-CLPesticides & Rtx-CLPesticides2 Columns

Rtx-CLPesticides and Rtx-CLPesticides2 columns are ideal for multiple environmental ECD methods. Here we demonstrate the effectiveness of this column pair for chlorinated pesticides, PCBs as Aroclors, chlorinated herbicides, and haloacetic acids. Includes EPA Methods 8081B, 8082A, 8151A, 504.1, 505, 508.1, and 552.2. Speed up your analyses and reduce downtime using the versatile Rtx-CLPesticides/Rtx-CLPesticides2 column pair in a dual column configuration. (PDF - 0MB)

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Reduce Helium Consumption by 68% Using Nitrogen Purge Gas for VOCs in Water

Labs analyzing purgeable organic compounds in water can save money and reduce helium dependence by using Method 524.4 with nitrogen purge gas and an Rtx-VMS column. By making the switch, you can reduce helium consumption by 68%, while meeting all Method 524.4 requirements. (PDF - 0MB)

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Accurately Quantify 380 Pesticides Using LC-MS/MS and GC-MS/MS

Stop spending your time and money developing LC-MS/MS or GC-MS/MS multiresidue pesticide methods and mixing reference standards when you could be running samples. Restek’s expert formulations chemists and chromatographers have already done the work for you—with guaranteed accuracy and at a lower cost. (PDF - 0MB)

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The First and Only Complete CRMs Formulated Specifically for EPA Method 525.3

Whether you analyze volatile organic compounds (VOCs) in drinking water using EPA Methods 525.2 or 525.3, Restek now offers a complete suite of CRMs containing all the compounds you need and none that you don't. (PDF - 0MB)

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Volatile Organic Reference Materials for U.S. EPA Method 8260

Restek offers all the required surrogate, internal standard, calibration check, matrix spike, and tuning mixtures required by EPA Method 8260. Our volatile organic reference materials are ready to use and prepared in as few solutions as possible for maximum shelf life. Fewer ampuls to open means fewer errors in preparation. (PDF - 0MB)

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Replacement Parts and Accessories for ASE Systems

Restek offers a wide range of replacement parts and accessories for accelerated solvent extraction to keep your ASE system running smoothly. We carry extraction cell parts, PEEK washers, collection vials, O-rings, filters, tools, and more, all economically priced and designed to meet or exceed the performance of the original manufacturer’s parts. (PDF - 2MB)

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Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges

Keep your organochlorine pesticides analysis GCs up and running by protecting them against matrix components. CarboPrep Plus cartridges surpass traditional Florisil products in removal of sample matrix compounds that cause analyte degradation and downtime due to failed calibration checks. Since CarboPrep Plus cartridges use the same equipment and procedure as Florisil cartridges, the impact to sample prep labs is minimal while the benefit to analytical lab productivity is tremendous. (PDF - 5MB)

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Improve Acrylamide Analysis with Allure Acrylamide LC Columns and Certified Reference Standards

Meet method requirements for food and drinking water quickly and easily with Allure Acrylamide LC columns, guards, and reference standards. (PDF - 2MB)

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Semivolatile Organic Reference Materials: US EPA Method 8270D/8270C and Appendix IX Target Compounds

Restek offers all the required surrogate, internal standard, calibration check, matrix spike, and tuning mixtures required by EPA Method 8270. Our semivolatile organic reference materials are ready to use and prepared in as few solutions as possible for maximum shelf life. Fewer ampuls to open means fewer errors in preparation. (PDF - 0MB)

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Improve Underground Storage Tank Compliance Monitoring with Restek CRMs

Analytical methods for underground storage tank testing often pose challenges and require unique mixtures for calibration and matrix spike samples. Restek tracks new developments in UST monitoring and responds with mixes to meet these needs. This flyer features fuel composite standards, single source fuel standards, fuel surrogate standards, fuel internal standards, and standards blended for specific state methods. (PDF - 0MB)

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