Air Sampling & Gas Sampling
Despite the growing popularity of electronic cigarettes, relatively little work has been done to characterize their vapor. In this study, we developed a quick, simple thermal desorption device for sampling vapor, as well as methods for analyzing vapor and solutions to determine nicotine content (GC-FID) and impurity profiles (GC-MS). This novel approach, which utilizes an Rtx®-VMS column, provides detectable levels of volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) from a single 40 mL puff.
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.
Whole Air Canister Sampling and Preconcentration GC-MS Analysis for pptv Levels of Trimethylsilanol in Semiconductor Cleanroom Air
Issues with trimethylsilanol scanner haze and optics haze have created a need for trace-level methods in the semiconductor industry. The whole air canister-based GC-MS method developed here couples pptv level sensitivity with near instant grab samples, allowing for the rapid screening of cleanrooms.
VOC testing laboratories can expand into new markets using existing air sampling canisters and thermal desorption tubes, due to the broad applicability of these techniques.
TO-Can air sampling canisters are electropolished and extensively cleaned, to provide a high-quality, passivated surface for improved stability of analytes listed in USEPA Method TO-15 (ambient air monitoring). For reactive compounds, such as sulfur-containing components, SilcoCan canisters are your best choice our exclusive Siltek® surface treatment ensures exceptional inertness and maximum sample stability, even for 1-20ppb sulfur compounds.
The use of carbon disulfide (CS2) extraction as an air monitoring method for vapor-phase organic compounds (VOCs) is fundamentally limited with respect to detection limits. Thermal desorption (TD) is a complementary gas extraction technique whereby sorbent tubes are heated in a flow of carrier gas. Trapped vapors desorb from the sample tubes into the gas stream and are transferred into the GC/MS analyzer. Here, we summarize the key advantages of thermal desorption versus solvent extraction.
Stable Sulfur & Mercury Sampling in Refineries - Using Siltek® and Sulfinert® Surface Treated Components
Refinery and natural gas samples often contain trace amounts of sulfur- and mercury-containing compounds, which can interfere with reactions, poison catalysts in petrochemical processes, and damage equipment. Because these compounds quickly react with stainless steel surfaces, accurate determination of these compounds is impossible when samples are collected and stored in untreated sample cylinders. Restek's Siltek® and Sulfinert® passivation techniques bond an inert layer into the surface of stainless steel, preventing active compounds from reacting with or adsorbing to the steel.
Early detection of structural mold is critically important to protecting human health and property values. Restek SilcoCan™ canisters allow low levels of microbial volatile organic compounds (MVOCs) to be detected in air samples before mold can be seen, providing an opportunity for structural repair and safer living conditions. The inertness of these canisters provides an exceptional storage environment, particularly for polar and high boiling point compounds.
Gas sampling bags can be a cost-effective alternative to canisters and thermal desorption tubes for many air monitoring applications, including VOCs and permanent gases. This 4-page flyer provides general guidelines, product specifications, and recommended applications. (PDF - 953kB)
This 4-page newsletter includes an analysis of Massachusetts DEP air-phase petroleum hydrocarbons, as well as an update on the U.S. EPA Photochemical Assessment Monitoring Stations (PAMS) program. Also features Tedlar® bags and air canisters. (PDF - 774kB)
This issue of Airmail includes a fast, sensitive analysis of TO-15 volatiles on a 30 m column, as well as an update on opportunities for air labs to collaborate with the EPA to meet Agency measuring and monitoring needs. Also features Tedlar® bags. (PDF - 867kB)
This issue of Airmail includes a 16 min GC analysis of TO-15 volatiles on a 30 m column, as well as an update on EPA guidance documents on vapor intrusion. Also features gas standards. (PDF - 1025kB)
Restek-exclusive Ultra-Clean resin is a great alternative to XAD®-2 resin for sampling semivolatiles. Learn more about how our GC-tested resin, as well as our polyurethane foam (PUF) plugs, can help you with your ambient, indoor, and industrial hygiene air-sampling applications. (PDF - 656kB)
Air sampling canisters from Restek are durable, easy to use, and highly inert. They weigh just grams more than canisters from other vendors and cost the same to ship. Check out this weight and cost comparison to see for yourself! (PDF - 1795kB)
This issue of Airmail discusses the increasing interest in testing volatile methylsiloxane (VMS) compounds in biogas using a new whole air canister-based GC-MS method developed for trimethyl silanol (TMS). Also features an air sampling canister weight comparison. (PDF - 1073kB)
Labs analyzing VOCs in air can nearly double sample throughput while meeting all Method TO-15 performance requirements by adopting Restek’s short column approach. As shown here, the use of an Rxi®-5Sil MS column (30 m x 0.32 mm ID, 1.00 µm) allows all requirements to be met in almost half the time required by typical 60 m setups. (PDF - 984kB)
This flyer give an overview of TD sampling and describes many applications that can be sampled using this versatile technique. Includes a comparison of tube and canister sampling, to help you determine which VOC sampling technique is best for you. (PDF - 177kB)
Thermal Desorption: A Practical Applications Guide: I. Environmental Air Monitoring and Occupational Health & Safety
Thermal desorption is now recognized as the technique of choice for environmental air monitoring and occupational health and safety. This 28-page publication from Markes International Ltd. presents several real world thermal desorption applications. (PDF - 1137kB)
Thermal desorption is used extensively for measuring volatile and semivolatile components in foods, flavors, fragrances, and odors. This 28-page publication from Markes International Ltd. presents several key applications. (PDF - 1952kB)
Thermal desorption is used extensively for forensic science. This 16-page publication from Markes International Ltd. presents several key applications including drugs, arson accelerants, trace explosives, shotgun propellant, and inks. (PDF - 665kB)
Cut cleaning time in half with a TO-Clean air canister cleaning system. This high-capacity unit hold twice as many air cans as similar products and is fully automated and easy to use. You can create and save custom cleaning programs that ensure consistency and make operation as easy as pressing start and walking away. (PDF - 930kB)
Thermal Desorption: A Practical Applications Guide: II. Residual Volatiles & Materials Emissions Testing
Thermal desorption is a convenient, fully automated alternative to solvent extraction for measuring residual volatiles. This 32-page publication from Markes International Ltd. details the testing of a wide variety of products using thermal desorption. (PDF - 1480kB)
Ambient air sampling involves collecting a representative sample of ambient air for analysis. There are two general approaches: 1) “whole air” sampling with canisters or Tedlar® bags and 2) “in-field concentration” sampling using sorbent tubes or cold traps. In this guide, we focus on collecting whole air samples in canisters, a flexible technique with many applications. (PDF - 1408kB)
A special issue of the Restek Essentials focused on air monitoring. Features products for sample collection through analysis, including whole air canisters, thermal desorption tubes, high purity resin, PUFs, gas standards, and GC columns and accessories. (PDF - 661kB)