Equilibrator

Equilibrator

 The EQUILIBRATOR Passive Diffusion Sampler (PDS or PDB) is used in place of purging and low-flow sampling methods in groundwater monitoring wells to obtain representative, discrete interval samples of Volatile Organic Compounds (VOCs) under natural groundwater flow conditions. 

For a comparison of the effectiveness of hydrasleeves for sampling from groundwater monitoring boreholes see US ITRC Sampling Report. For a list of pros and cons, dos and don'ts for using Passive Diffusion Bags such as the Equilibrator, see PDBs pros and cons. 

Simply fill the sampler with deionized water, install one or more PDBs in the zone(s) of interest and return at the next sample event to collect samples and replace samplers. 

The EQUILIBRATOR is also used in surface water and in stream bed sediments and embankments to identify and monitor VOC contaminant discharge areas. The EQUILIBRATOR can be used to sample discrete and multiple intervals in a borehole well casing. Obtain concentration profiles at multiple intervals simultaneously by attaching several Hydrasleeve samplers to a single tether line.
 
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