||Acquisition of Representative Ground Water Quality Samples for Metals.
Puls, R. W. ;
Powell, R. M. ;
||Robert S. Kerr Environmental Research Lab., Ada, OK. ;ManTech Environmental Technology, Inc., Ada, OK.
Ground water ;
Fluid filtration ;
Rates(Per time) ;
Water quality indicators
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||R.S. Kerr Environmental Research Laboratory (RSKERL) personnel have evaluated sampling procedures for the collection of representative, accurate, and reproducible ground water quality samples for metals for the past four years. Intensive sampling research at three different field sites has shown that the method by which samples are collected has a greater impact on sample quality, accuracy, and reproducibility than whether the samples are filtered or not. In particular, sample collection practices that induce artifically high levels of turbidity have been shown to have the greatest negative impacts on sample quality. Results indicated the ineffectiveness of bailer for collection of representative metal samples. Inconsistent operator usage together with excessive purging generally resulted in excessive turbidity and large differences in filtered and unfiltered metal samples. The use of low flow rate purging and sampling consistently produced filtered and unfiltered samples that showed no significant differences in concentrations. Turbidity levels were generally less than 5 NTUs, even in fine-textured glacial till. The authors recommend the use of low flow rates, during both purging and sampling.
||Pub. in FOCUS: Ground Water Monitoring Review, v12 n3 p167-176 Summer 1992. Prepared in cooperation with ManTech Environmental Technology, Inc., Ada, OK.
|NTIS Title Notes
||PC A03/MF A01