For Soil Gas and Indoor/Ambient Air Sampling, the Choice is Clear!

• Samples are collected over a period of days or weeks to provide a time-weighted average measurement

• Passive samples are collected in steady-state conditions and are more representative of actual soil gas concentrations than when a vacuum is applied to the sampling hole with an evacuated canister

• Soil gas concentrations vary and long duration samples are less likely to miss contamination as opposed to a sample collected over a matter of minutes or hours, which may be during a period when the soil gas concentration is low or non-detectable (ND)

• Sorbent samplers are thermally conditioned to be devoid of contaminants between uses, while canisters are difficult to clean and prone to cross contamination from one sampling event to another

• Analyses uses TD-GC/MS instruments by Method TO-17 with low concentrations in the pptv range possible

• Passive samplers have no mechanical parts and do not require helium shrouds, helium tanks, and other equipment required with active soil gas sampling

• Passive samplers are small and easier to use in the field and require less time and labor to collect a sample

• When temporary vapor wells are created to collect an active soil gas sample, the sample is collected after an equilibrium period (typically 1 day or more)

• Beacon provides color isopleth maps as part of the data deliverable package for interpretation of the data

Learning more about Beacon’s Passive Air Samplers? Contact us today.