Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

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
NIOSHTIC No.
20025410
Abstract
National 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.
Keywords
Chromium-compounds; Air-sampling-equipment; Air-sampling-techniques; Workplace-monitoring; Sample-preparation; Sampling-methods; Air-sampling; Analytical-methods
Contact
National Institute for Occupational Safety and Health, Spokane Research Laboratory, 315 E. Montgomery Avenue, Spokane, WA 99207
CODEN
JOEHA2
CAS No.
7440-47-3; 16065-83-1; 18540-29-9
Publication Date
20040901
Document Type
Journal Article
Email Address
PDrake@cdc.gov
Funding Type
Construction
Fiscal Year
2004
NTIS Accession No.
NTIS Price
Issue of Publication
9
ISSN
1545-9624
NIOSH Division
DART; SRL
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
Journal of Occupational and Environmental Hygiene
State
ID; OH; WA
TOP