Low-flow groundwater sampling demonstration using a TROLL 9500 water quality instrument and In-Situ Inc.’s Low Flow rental kit. Low-flow purging and sampling (ASTM standard D67771) is a well-known method of extracting groundwater samples from a well at a very low rate ( less than 500 mL/min) in order to minimize contaminant volatilization and amount of […] ↓ Read the rest of this entry…