Passive sampling offers several advantages over conventional sampling. The sampler is in place for a longer period of time (often days or weeks), accumulating the analytes. The result is an average of the concentration during this time, which eliminates the risk of non-detection of, for example, occasional peaks in emitted pollutants.

PS Organic is our passive sampling method for non-polar organic compounds, such as PAH, PCB, and dioxins. The sampler consists of a stainless steel canister that holds from one to five membranes. These are mounted in so-called spider carriers. The canister and the spiders can be hired or purchased. Alternatively, a much smaller and simpler disposable canister, which holds one or two shorter membranes, can be used. There is also a well canister for use in groundwater sampling tubes. The membranes may also be mounted under a hood for air sampling. The hood can be placed directly on the ground or hanged e. g. in a tree.

The membrane contains a lipid which easily dissolves hydrophobic substances. The length of the sampling period is variable, but is often about one month. During this time organic pollutants in dissolved or gas phase diffuse through the membrane and accumulate in the lipid. This uptake mimics the accumulation of organic pollutants in, for example, fish. The organic compounds are then extracted from the membrane for subsequent chemical analysis by conventional methods. From the analytical result, concentrations in the sampled medium can be calculated.

Sampling equipment

PS Organic, standard size (91.4 cm)

PS Organic, 15.5 cm

Canister (for 2 spiders)

Spiders

Disposable deployment device

Canister for groundwater wells

Hood for air sampling

* In the event of loss, the price for purchase will be charged. ** This item is assembled and enclosed in a tin can when delivered.