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  Passive Groundwater Sampling / Zero Purge

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Zero purge methods use passive sampling devices to collect samples at discrete depths in the borehole column with minimal disturbance.

Good for:
Sampling from short screened monitoring wells
VOC sampling
Analytical results are generally comparable to low flow
methods
Simple sampling procedure - no purging required.
No purge water generated for disposal

Issues:
Use in long screened boreholes (>6m) is questionable
Specialist technical knowledge in designing sampling protocols is advisable.

Suitable equipment from Waterra: Hydrasleeves, Equilibrators

See Also:

Groundwater Sampling Methods

Fixed Volume Groundwater Purge and Sampling

Low Flow Groundwater Purging and Sampling

Research and Development in Groundwater Sampling Methods

Borehole Purge Volumes

Waterra Tubing Diameters and Volumes