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 1 Field method for the determination of insoluble or total hexavalent chromium in workplace air
Authors Hazelwood-KJ; Drake-PL; Ashley-K; Marcy-D 
Source J Occup Environ Hyg 2004 Sep; 1(9):613-619 
Link http://www.informaworld.com/smpp/content~content=a713658038 
NIOSHTIC No. 20025410 
AbstractNational Institute for Occupational Safety and Health method 7703 is a portable field procedure for the analysis of workplace air filter samples for hexavalent chromium (CrVI) content immediately after the samples are collected. The field method prescribes CrVI extraction from air filter samples with an ammonium sulfate/ammonium hydroxide extraction buffer using ultrasonic extraction (UE). Strong anion-exchange solid-phase extraction (SAE-SPE) is then used to separate CrVI from trivalent chromium and other interferences. Portable spectrophotometric measurement of CrVI is then conducted using the 1,5-diphenylcarbazide (DPC) method. However, it has been found that the ammonium extraction buffer does not adequately bring insoluble CrVI compounds into solution during the UE process. Thus, it was deemed necessary to modify the field method so that it would provide acceptable recoveries for insoluble CrVI compounds. To this end, a more alkaline extraction solution - sodium carbonate/sodium bicarbonate buffer - was investigated. The modified procedure using the highly alkaline extraction solution was demonstrated to be compatible with SAE-SPE cartridges when determining insoluble CrVI in air filter samples. It was found that the carbonate/bicarbonate buffer was equally effective for complete dissolution of both insoluble and soluble forms of CrVI. Furthermore, the modified procedure met desired performance criteria established for air sampling and analytical methods. 
KeywordsChromium-compounds; Air-sampling-equipment; Air-sampling-techniques; Workplace-monitoring; Sample-preparation; Sampling-methods; Air-sampling; Analytical-methods 
ContactNational Institute for Occupational Safety and Health, Spokane Research Laboratory, 315 E. Montgomery Avenue, Spokane, WA 99207 
CODENJOEHA2 
CAS No.7440-47-3; 16065-83-1; 18540-29-9 
Publication Date20040901 
Document TypeJournal Article 
Email AddressPDrake@cdc.gov 
Funding TypeConstruction 
Fiscal Year2004 
NTIS Accession No. 
NTIS Price 
Issue of Publication9 
ISSN1545-9624 
NIOSH DivisionDART; SRL 
Priority AreaResearch Tools and Approaches: Exposure Assessment Methods 
Source NameJournal of Occupational and Environmental Hygiene 
StateID; OH; WA 
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