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Evaluation of a standardized method for determining soluble silver in workplace air samples.

Authors
Drake-PL; Marcy-AD; Ashley-K
Source
J Environ Monit 2006 Jan; 8(1):134-139
NIOSHTIC No.
20029291
Abstract
Several occupational exposure limits and guidelines exist for silver, but the values for each depend on the chemical form of the silver compound in question. In the past, it generally was not possible, without prior knowledge of the work process, to distinguish soluble silver from insoluble silver compounds collected in workplace air samples. Therefore, analytical results were historically reported as total silver. In this study, work was conducted to evaluate a method to differentiate between the quantities of water-soluble silver compounds and total silver collected on filters. The investigation entailed an evaluation of an International Organization for Standardization method to determine soluble silver in airborne particulate matter. The study design incorporated laboratory experiments to evaluate analytical figures of merit, such as selection of appropriate filter media and extraction solution, analytical recovery, and sample stability during storage. Polytetrafluoroethylene (PTFE) filters (2 microm, 37 mm) in opaque cassettes were either spiked with known amounts of silver nitrate or contained a known mass of solid silver nitrate. Results showed that over 90% of the silver was recovered from PTFE filters. Also, field studies were conducted in which workplace air samples were collected in two silver refineries. Some of these samples were analyzed only for soluble silver while others were sequentially extracted and analyzed, first, for soluble silver, then for total silver. The mass fractions of soluble silver, as compared to total silver, were approximately 2% or less. This investigation served to validate an international standard procedure for the determination of soluble silver in workplace air samples.
Keywords
Silver-compounds; Air-sampling; Air-samples; Occupational-exposure; Exposure-limits; Chemical-analysis; Airborne-particles; Particulates; Particulate-dust; Airborne-dusts; Laboratory-testing; Filters
Contact
US Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Spokane Research Laboratory, 315 E. Montgomery Ave., Spokane, WA 99207, USA
CODEN
JEMOFW
CAS No.
7440-22-4; 9002-84-0
Publication Date
20060101
Document Type
Journal Article
Email Address
pdrake@cdc.gov
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
1464-0325
NIOSH Division
SRL; DART; DSHEFS
Priority Area
Research Tools and Approaches: Surveillance Research Methods
Source Name
Journal of Environmental Monitoring
State
WA; OH; ID
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