Range of Sampling and Analytical Options
Partnering with Eurofins Air Toxics on your next soil gas project will give you access to a range of sampling and analytical options unmatched by any other air lab. Our capabilities and expertise in these techniques provide you with the tools to meet your project and quality objectives in a cost-effective manner.
Field Sampling Equipment
For sites requiring conventional summa canister samples for soil gas collection, Eurofins Air Toxics can provide additional sampling equipment to assist with purging lines prior to collection, conducting leak checks on the train, monitoring vacuum at the extraction probe and performing an equipment train blank. Equipment available from the lab includes soil gas manifolds, certified and pressurized canisters of zero air or nitrogen and helium shrouds. A range of canister sizes (0.25 to 6 Liters) and flow controllers are available to meet project specific objectives.
TO-15 Analytical Options
Eurofins Air Toxics has a range of TO-15 products to meet your soil gas screening levels. Screening levels can vary widely depending on the regulatory requirements and the type of soil gas sample collected. Screening levels for soil gas extracted directly below a building (sub-slab soil gas) can be in the sub-ppbv range and require a trace level analysis such as TO-15 “Low-level” with reporting limits on the order of 0.1 ppbv. By comparison, deep soil gas samples collected near the contaminant source may require much higher screening levels. These samples also have the potential to contain ppmv or higher concentration levels. Our TO-15 (5&20) product line was designed to handle these types of soil gas with a concentrator optimized to minimize dilution and minimize carryover.
The TO-15 (5&20) product is a cost-effective soil gas solution providing:
- Mid-range reporting limits (5 ppbv - 20 ppbv) perfect for soil gas screening levels
- 1000 X calibration range to effectively analyze high concentration samples
- Accurate reporting of oxygenates and naphthalene
- Direct calibration using NIST-traceable vapor phase standards
- Rigorous cleaning and media certification protocols
- Full scan MS data allows for full characterization of soil gas
- Wide selection of leak check compounds available
- 100% of data validated against TO-15 requirements
Eurofins Air Toxics is the leader for sorbent-based soil gas collection techniques, developing and implementing active and passive applications to meet the industry need. Active collection of soil gas on thermal desorption sorbent tubes can provide several advantages over TO-15 canisters. From a shipping and handling perspective, the small and compact size of the sorbent tubes translates to lower costs and less space as compared to canisters. The sensitivity of the TO-17 technique also means that small volumes (typically <100 mL) are required to meet screening levels, allowing for the use of a simple volumetric syringe to pull soil vapor through the sorbent tube. This removes the need to use pumps in the field. Additionally, TO-17 is ideal for measurement of compounds with a low vapor pressure which do not reliably recover from a TO-15 sampling train. Sites impacted with middle distillate fuels and those for which naphthalene and the light PAHs are compounds of concern are suited for the TO-17 technique.
Waterloo Membrane Sampler™ (WMS)
Passive sorbent samplers have been used for years to map soil gas plumes and provide qualitative information regarding VOCs in the subsurface. Recent published studies have shown that properly designed passive sorbent samplers can provide quantitative soil gas measurements comparable to conventional active methods. The innovative “low-uptake” version of the WMS sampler has demonstrated correlation in the field with TO-15 summa canisters. The performance of the WMS sampler and the relatively simple deployment protocols required make it a convenient and cost-effective option for soil gas investigations. Over the past 5 years, Eurofins Air Toxics has assisted in the evaluation and development of the WMS sampler for soil gas and ambient air applications. Our experience with the WMS passive sampler is second to none.