METHOD AND APPARATUS FOR TAKING SAMPLES FROM A GROUNDWATER MONITORING SITE

摘要

PCT No. PCT/DE90/00260 Sec. 371 Date Dec. 5, 1990 Sec. 102(e) Date Dec. 5, 1990 PCT Filed Apr. 2, 1990 PCT Pub. No. WO90/12305 PCT Pub. Date Oct. 18, 1990.A method for taking samples from a groundwater monitoring site realized by measuring an electric conductivity of contaminated groundwater during operating a pump at high r.p.m. and by controlling a predetermined minimum variation of the electric conductivity over a predetermined period of time with subsequent operating of the pump at low r.p.m.