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OLS Field Name OLS Field Data
Main Title Determination of stable valence states of chromium in aqueous and solid waste materials /
Author Messman, J. D. ; Churchwell, M. E. ; Wong, D. ; Lathouse, J.
CORP Author Battelle Columbus Div., OH.;Environmental Monitoring and Support Lab.-Cincinnati, OH.
Publisher U.S. Environmental Protection Agency, Environmental Monitoring and Support Laboratory,
Year Published 1986
Report Number EPA/600/4-86/039; EPA-68-03-3224
Stock Number PB87-140927
OCLC Number 16128460
Subjects Chromium. ; Valence (Theoretical chemistry)
Additional Subjects Chemical analysis ; Chromium ; Valence ; Chemical properties ; Spectroscopic analysis ; Environmental samples ; Solid wastes
Internet Access
Description Access URL
http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=9101VYPU.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
EJBD ARCHIVE EPA 600-4-86-039 Headquarters Library/Washington,DC 03/04/2014
EOBD  EPA 600/4-86-039 NEIC Library/Denver,CO 05/25/2009 STATUS
NTIS  PB87-140927 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation xxii, 112 leaves : illustrations ; 28 cm
Abstract
The objective of the research effort was to experimentally assess the chemical behavior of the stable species of chromium during the preparation, chemical manipulation, and spectrophotometric analyses of simulated and authentic environmental samples for hexavalent chromium. The diphenylcarbazide colorimetric method was found to be specific and sensitive for Cr(VI), as either dichromate or chromate, in simulated aqueous solutions containing up to 1000-fold ratios of Cr(III). Problems of reduction were encountered with the method for analyses of simulated samples containing excesses of both Cr(III) and sulfide. Studies of selected digestion methods for the analyses of insoluble chromates revealed that the alkaline digestion generally provided satisfactory recoveries of Cr(VI) however, the nitric acid digestion was inadequate for the conditions studied. Although Cr(VI) spikes were stable in alkaline digests of most of the environmental samples studies, Cr(III) spikes were found to be partially oxidized in the alkaline digests, resulting in positive errors by as much as 100% in Cr(VI) measurements.
Notes
Draft final report Bibliographical references: leaf 112. Battelle Laboratories for the U.S. Environmental Protection Agency. Photocopy.