Collaborative testing of NIOSH atomic absorption method.
Colovos-G; Eaton-WS; Ricci-GR; Wang-LS
NIOSH 1979 Aug; :1-166
An atomic absorption spectrometry (AAS) method for determining metallic elements in the air of workplace environments was evaluated. Statistical screening techniques used to ruggedize the method for eight of nine test metals resulted in the use of balanced incomplete block design experiments that clearly differentiated between affecting and nonaffecting parameters. A dynamic aerosol generation and sampling system was developed that generated particles within a size range of 0.1 to 10 microns. Collaborative testing was performed by 16 laboratories on five of the nine test metals using generated filters characterized by the host laboratory of Rockwell-EMSC, and by an independent laboratory using x-ray fluorescence analysis. The five metals were tested at three concentrations with three sets of generated aerosol samples, based on the primary test factors of laboratory, metals, concentrations, and time. Laboratory was a significant factor for all metals, and concentrations were significant only for cadmium (7440439) and lead (7439921). Recoveries for the five metals were between 96.6 and 100 percent, and the agreement of results between the 16 laboratories and the independent one verified the accuracy of the Rockwell-EMSC filter. Results from spiked filters and solutions confirmed the accuracy and precision of the method independent of the generation system and digestion procedure. The authors conclude that the overall performance of the AAS was excellent.
NIOSH-Author; NIOSH-Contract; Contract-210-76-0151; Analytical-methods; Metallic-dusts; Atomic-absorption-spectrometry; Working-areas; Screening-tests; Sample-collection; X-ray-analysis
NTIS Accession No.
(NIOSH) 79-144; Contract-210-76-0151
National Institute for Occupational Safety and Health