Record Display for the EPA National Library Catalog


Main Title Acquisition of Representative Ground Water Quality Samples for Metals.
Author Puls, R. W. ; Powell, R. M. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK. ;ManTech Environmental Technology, Inc., Ada, OK.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/308;
Stock Number PB92-227487
Additional Subjects Metals ; Ground water ; Pumping ; Fluid filtration ; Arsenic ; Chromium ; Rates(Per time) ; Sampling ; Concentration(Composition) ; Water quality indicators
Library Call Number Additional Info Location Last
NTIS  PB92-227487 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 13p
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.