Soil gas samplerCollect gases from soil through a closed system. When sampling, insert the sampling tube or probe into the soil, use a vacuum pump or negative pressure device to extract gas from the soil, and collect it into a sample bottle or sampling bag.

According to different sampling methods,Soil gas samplerIt is mainly divided into the following two categories:

The active soil gas sampler actively extracts gases from the soil through vacuum pumps and other pumping devices. High sampling efficiency ensures that the samples come from the target depth, making it suitable for scenarios that require precise control of sampling conditions.

A passive soil gas sampler is a device that fills adsorption materials into small adsorption tubes and places them in soil boreholes or monitoring wells for several days, allowing gaseous pollutants to be adsorbed into the material along with the flow of soil gas, and then removed for degassing analysis. Easy to operate, low cost, but susceptible to atmospheric backflow interference, limited representativeness.

Selection suggestion:

Clear sampling purpose: Select the appropriate sampler type based on research needs. For example, investigation of contaminated sites may require active samplers to obtain accurate data, while rapid screening may choose passive samplers.

Consider sampling depth and diameter: Sampling depth usually ranges from the surface to tens of meters, and diameter ranges from a few centimeters to tens of centimeters. The greater the depth and diameter, the higher the difficulty and cost of sampling.

Assessing soil conditions: Different soil types have different requirements for samplers.

Pay attention to device portability: For field monitoring, it is necessary to choose lightweight and easy to carry samplers to improve work efficiency.