Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Single-Laboratory Evaluation and Modification of U.S. EPA (Environmental Protection Agency) Methods 7470 and 7471 for the Determination of Mercury in Aqueous and Solid Hazardous Wastes (Journal Version).
Author Churchwell, M. E. ; Livingston, R. L. ; Sgontz, D. L. ; Messman, J. D. ; Beckert, W. F. ;
CORP Author Battelle Columbus Div., OH.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Publisher c1988
Year Published 1988
Report Number EPA-68-03-3226; EPA/600/J-87/452;
Stock Number PB89-130389
Additional Subjects Chemical analysis ; Mercury(Metal) ; Hazardous materials ; Methodology ; Quality control ; Concentration(Composition) Atomic spectroscopy ; Reprints ; U.S. EPA
Library Call Number Additional Info Location Last
NTIS  PB89-130389 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/14/1989
Collation 17p
The current U.S. Environmental Protection Agency (U.S. EPA) protocols for mercury determinations in aqueous and solid waste samples (SW-846 Methods 7470 and 7471) using recirculating cold-vapor atomic absorption spectrometry (CV-AAS) have been evaluated. The U.S. EPA protocols have been modified in a single-laboratory study to facilitate additional QC measures, to enhance detectability for low-level mercury concentrations, and to eliminate nonspecific vapor absorption interferences. Volumetric manipulations for additional QC measures, if required, are facilitated by performing the sample digestions in Erlenmeyer flasks rather than in the current Biochemical Oxygen Demand (BOD) reduction-aeration bottles. Instrument detectability is improved 10-fold by using a gas sparging bottle as a dedicated reduction-aeration vessel and a silver wool-amalgamation CV-AAS system operated in an open configuration. The on-line amalgamation thermal desorption process of the modified CV-AAS system eliminates interfering water and organic matrix vapors prior to the mercury absorption measurement. Good accuracy and precision have been obtained with the amalgamation CV-AAS system for the analyses of four reference sediment materials. (Copyright (c) 1988 Pergamon Press.)