Record Display for the EPA National Library Catalog


Main Title Metals in Ground Water: Sampling Artifacts and Reproducibility.
Author Puls, R. W. ; Clark, D. A. ; Bledsoe, B. ; Powell, R. M. ; Paul, C. J. ;
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-92/307;
Stock Number PB92-227479
Additional Subjects Metals ; Ground water ; Water pollution ; Sampling ; Colloids ; Environmental transport ; Turbidity ; Flow rate ; Water flow ; Pumping ; Water wells ; Dissolved gases ; Oxygen ; pH ; Temperature ; Filtration ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB92-227479 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 16p
Field studies evaluated sampling procedures for determination of aqueous inorganic geochemistry and assessment of contaminant transport by colloidal mobility. Research at three different metal-contaminated sites has shown that 0.45 um filtration has not removed potentially mobile colloids, when samples have been collected using low pumping flow rates (approx. 0.2-0.3 L/min). However, when pumping velocities greatly exceed formation groundwater flow velocities, large differences between filtered and unfiltered samples are observed, and neither are representative of values obtained with the low flow-rate pumped samples. There was a strong inverse correlation between turbidity and representativeness of samples.