Purge and Trap Concentrator Sampler

Environmental Volatiles Analysis by GCMS

QP2020 NX beside picture of a faucet with someone getting water

To follow US EPA guidelines for analyzing volatile organic compounds (VOCs) in water and other environmental samples, the use of a purge and trap is required for extracting and introducing the sample into a GCMS. Laboratories performing EPA methods EPA 524.2, EPA 524.3, or EPA 524.4 in support for complying with the Safe Drinking Water Act (SDWA) need to provide their customers reliable data to demonstrate the concentrations of VOCs are below the Maximum Contaminant Levels established in the SDWA. Similarly, laboratories analyzing VOCs environmental samples according to EPA 624 and EPA 8260 in support to the regulatory requirements under the Clean Water Act or the Resource Conservation and Recovery Act need to report results in accordance to strict quality assurance requirements in a timely manner . No matter the EPA method your lab is following for VOCs analysis, a reliable and robust system is required to meet the demands put on the lab such as fast turn-around time. Using the Shimadzu GC-MS coupled to one of a variety of purge and trap units, the laboratory will be focused on productivity instead of the performance or robustness of the GC-MS for achieving and maintaining quality assurance criteria outlined in the corrsponding environmental method.


EST Evolution and Accessories


EST Evolution Purge and Trap Concentrator Sampler
  • Low carryover, superior moisture control, easy maintenance, user diagnostics, and excellent chromatographic peak resolution
  • ARID technology for advanced moisture control
  • Inert tubing to reduce carryover
  • Graphic user interface
  • Autosampler options: Water Only or Water-Soil

As detection limits have been pushed lower, and Mass Spectrometer systems more sensitive, moisture control is the key to the overall stability of the complete VOC system. The EST Evolution is designed to remove water during the purge process. As you purge, the water and VOCs travel through the Moisture Reduction Trap (MoRT), preventing the water from contacting the analytical trap, minimizing volume of the desorb pathway, and sharpening chromatographic peak resolution. With a cool-down time of less than two minutes, cycle time and productivity are optimized.

In the Centurion AS, water vials are never moved to a processing station, but remain in the autosampler tray, saving time. The Centurion uses a fixed loop to deliver reproducible volumes of sample to the concentrator. The optional syringe can be used for dilutions (up to 1:200) or to generate calibration standards at point-of-use so they don’t degrade with time.


For additional information about environmental solutions, visit our Environmental Page

Relevant Application Notes

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