Ground Water Sampling for Metals Analyses. Superfund Ground Water Issue

摘要

Filtration of ground-water samples for metals analysis is an issue identified by the Regional Superfund Ground Water Forum as a concern of Superfund decision-makers. RSKERL-Ada and EMSL-Las Vegas convened a technical committee of experts in the areas of ground-water geochemistry, inorganic chemistry, colloidal transport and ground-water sampling technology to examine the issue and provide technical guidance based on current scientific information. The findings and recommendations of the committee were that use of a 0.45 micron filter was not useful, appropriate or reproducible in providing information on metals mobility in ground-water systems, nor was it appropriate for determination of truly 'dissolved' constituents in ground water. A dual sampling approach was recommended, with collection of both filtered and unfiltered samples. This means that added emphasis is placed on appropriate well construction methods, materials and ground-water sampling procedures.