SRI EPA METHOD 5030/5035 PURGE AND TRAP
- Built into the GC for lower dead volume and better peak shapes
- No need for transfer lines
- Two independently heated adsorbent traps
- Complies with EPA Methods
- Peaksimple control
The SRI Purge & Trap concentrates the volatile organic compounds (VOCs) in a gas, water, or soil sample onto two adsorbent traps, from which they are automatically desorbed onto the GC column. The Method 5030/5035 Compliant Purge & Trap is equipped with interchangeable purge heads. The 5035 purge head is a thermostatted (typically 40°C) sleeve which accepts standard 40mL VOA vials. The entire sleeve is mechanically agitated while purging to comply with the requirements of EPA Method 5035. The 5030 purge head uses low-cost, disposable 16mm test tubes which are purged at ambient temperature. For higher level soil samples or soil/methanol extractions, the test tube is more convenient and less expensive than VOA vials.
Operation of the Purge & Trap is completely automated by the PeakSimple data system that is built into the GC. Run parameters such as purge time, desorb heat, bake-out, vial temperature, and mechanical agitation are adjusted in a PeakSimple Event table.
The SRI Purge & Trap is unique because it is equipped with two traps rather than one. Each trap can be heated independently at the adsorption temperature (typically 35-70°C), the desorption temperature (200°C), and the bake-out temperature (250°C). For most VOC applications, the first trap is Tenax-GR, and the second trap is Carbon Molecular Sieve. By setting the adsorption temperature of the Carbon MoleSieve to 50-60°C and the Tenax-GR to 35°C, water retention is dramatically reduced. By staggering desorption times, early eluting peaks from the hot Carbon MoleSieve trap are refocused on the temporarily cold Tenax-GR trap, resulting in much sharper peaks than otherwise possible
SRI GC INJECTOR OPTIONS
Each SRI GC comes standard with one 1/8" cold on-column injector for use with either 0.53mm I.D.
capillary or 1/8" packed columns, see below. This type of injector allows the sample to be deposited directly into the bore of the column and avoids any contact with the injector port surfaces. This eliminates the need for a heated injector and is ideal for 0.53mm I.D. capillary columns.
- For solids, choose the Thermal Soil Desorber or the Heated Static Headspace.
- For liquids, choose the Cold On-Column, Heated Flash On-Column, Heated Split/Splitless, or the Heated Static Headspace.
- For gases, choose the 10 Port Gas Sampling Valve or the Purge and Trap.
- Add automation with the Method 5030 Purge and Trap Autosampler, or the 42 Vial Liquid Autosampler.
Up to 5 injector types, covering solids, liquids and gases can be mounted simultaneously onto the Model 8610C GC mainframe. Due to limited space, only one injector can be mounted on the Model 310 GC. Click on the links below to go directly to the specific information on the available injector hardware.
Heated Flash Vaporization, Heated Split/Splitless and PTV injectors are all upgrades to the On-column injector. All injectors must be installed at the SRI factory.