Resprep solid phase extraction (SPE) tubes are manufactured with specially cleaned sorbents and high-purity materials to minimize background and help eliminate troublesome interference. In order to ensure reproducibility, every finished product goes through rigorous QC testing, targeted to specific applications whenever possible, and an extensive certificate of analysis details the results. In addition, each box contains multiple foil bags of tubes to improve shelf life and keep unused sorbents factory-fresh. If you want proven quality and superior cleanliness with method-specific performance, you want Resprep SPE tubes.

Resprep SPE tubes are available with the following sorbents:

    • Silica: Multipurpose
    • EPH Silica: Petroleum
    • Florisil Adsorbent: Pesticides
    • CarboPrep Adsorbent: Dirty Samples

FREE samples are also available! Contact us or your local Restek representative.

Resprep EPH Fractionation SPE Cartridge

  • Method-specific performance for extractable petroleum hydrocarbon (EPH) analysis of soil and water samples.
  • Complete separation of aliphatic and aromatic compounds into distinct fractions.
  • Guaranteed background level under the strict reporting limits of MA and NJ EPH methods.
  • Superior lot-to-lot reproducibility and storage stability ensured by rigorous QC testing and moisture-resistant packaging.

Method Specific SPE Cartridges

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

Resprep SPE Cartridges (Normal Phase)

Hydrophilic (polar) 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.

Technical Articles


Lowering Detection Limits for 1,4-Dioxane in Drinking Water Using Large Volume Injection in an Unmodified Splitless GC Inlet

Concurrent solvent recondensation–large volume splitless injection (CSR-LVSI) typically requires a special GC inlet. The technique described here uses an unmodified split/splitless inlet with CSR-LVSI to lower detection limits for the analysis of 1,4-dioxane in drinking water.

General Interest

Determining Pesticides in Dietary Supplements with QuEChERS Extraction, Cartridge SPE, and GCxGC-TOFMS

The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS analysis, resulting in good recoveries for a wide range of pesticides in dietary supplements. Matrices include dandelion root, sage, and a multi-herb finished product.


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.


Large Volume Splitless Injection Using an Unmodified Split/Splitless Inlet and GC-TOFMS for Pesticides and Brominated Flame Retardants

Concurrent solvent recondensation large volume splitless injection (CSR-LVSI) GC/MS is used here for analyzing pesticides and brominated flame retardants in drinking water based on EPA Method 527. CSR-LVSI allows a time-consuming sample extract concentration step to be eliminated, but can also be used with extract concentration for lower detection limits.

PDF Document

Florisil SPE Cleanup for Chlorinated Pesticides Analysis

Florisil SPE tubes are ideal for cleanup of sample extracts prior to GC-ECD analysis of chlorinated pesticides. By using Florisil tubes for extract cleanup, background interferences can be reduced and recoveries can be improved. (PDF - 1304kB)

PDF Document

A New Solution for Trace-Level Analysis of 1,4-Dioxane in Drinking Water: Large Volume Injection in an Unmodified Splitless GC Inlet

Quantify 1,4-dioxane in drinking water down to 5.0 ppt using a new approach. The technique described here uses an unmodified split/splitless GC inlet with concurrent solvent recondensation–large volume splitless injection (CSR-LVSI) to lower detection limits. This 8-page brochure details system setup, sample prep, and analysis. (PDF - 1812kB)

PDF Document

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 - 1279kB)

PDF Document

Improve Results for Chlorinated Pesticides With Resprep CarboPrep SPE Cleanup

Ensure cleaner sample extracts and obtain high recoveries of target pesticides by adding a Resprep CarboPrep SPE cleanup step when preparing samples for chlorinated pesticides analysis. (PDF - 1683kB)

PDF Document

Prepare Olive Oil Samples for Pesticide Residue Analysis in Half the Time with a Fraction of the Solvent Using dSPE

Simplify and speed up sample preparation with Resprep dSPE tubes! Here we show the extraction and clean-up of pesticide residues from olive oil samples—twice as fast as GPC, with only a fraction of the solvent required for conventional SPE. (PDF - 270kB)

PDF Document

Method-Specific Sample Preparation for EPH Analysis

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. (PDF - 2501kB)