Polyethylene Diffusion Bags PDB
Meaning, Term, and Glossary Definition - What is Polyethylene Diffusion Bags PDB?
Polyethylene Diffusion Bags are bags used to collect water samples for laboratory testing of volatile organic compounds (VOCs). Polyethylene Diffusion Bags are sometimes abbreviated as PDB, but the original PDB acronym stands for passive diffusion bags.
PDB samplers are simply low-density polyethylene bags (LDPE) filled with deionized water. In groundwater wells, these PDB samplers are used as passive devices, relying on the natural movement of groundwater through the well screen. The groundwater VOCs diffuse across the bag material until concentrations inside the bag sampler reach an equilibrium with concentrations in the surrounding groundwater.
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Related glossary terms:
Diffusion High-Density Polyethylene Low Density Polyethylene LDPE Rigid Porous Polyethylene RPP 
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