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This report analyzes the results of laboratory and field studies that allow a direct experimental comparison among commonly used monitoring well casing materials (stainless steel, Teflon, rigid PVC) in terms of their potential effects on measurements of trace organic compounds. Each of the studies analyzed attempts to determine experimentally how much -- if any -- sorption occurs, or what differences result among measured concentrations of a series of organic compounds.
In comparing the measured trace concentrations to determine whether the well casing materials cause significant differences in results, a ratio was formulated to reflect the relative sorption effects of each of the materials; sensibly constant ratios over a reasonable range of trace concentrations would indicate few, or relatively minor, differences between the various materials, while varying ratios would indicate larger differences. Conclusions are drawn about similarities and differences in sorption behavior; additional observations about sample variation, effects of well purging, and limited measurements of non-volatile compounds are noted.
sorption, well casing materials, monitoring trace organics, Teflon/PVC/stainless steel
President, R. M. Dowd & Company, Washington, D.C.,