Portable monitors for airborne lead at mining sites.
Drake-P; Lawryk-N; Sussell-A; King-B; Ashley-K
American Industrial Hygiene Conference and Exposition, June 1-6, 2002, San Diego, California. Fairfax, VA: American Industrial Hygiene Association, 2002 Jun; :28
Field portable instruments can be useful tools in protecting workers from excessive airborne lead exposures. At the present time, the most commonly used methods for measuring airborne lead involve collecting air samples on filters and sending them to an off-site laboratory, where a variety of analytical methods can be used. 1\.,10 methods for measuring airborne lead using field portable instruments have been developed by NlOSH: method 7702 uses X-Ray Fluorescence (XRF), and method 7701 uses anodic stripping voltarnmetry (ASV). This study evaluated the two portable methods at mining sites. Air samples were collected throughout two mills that processed ore from nearby mines, where the primary constituent of the ore was lead sulfide. Air samples were collected on 37 mm mixed cellulose ester membrane filters. At the end of the work shift, the filter cassettes were collected and taken to a room off-site for analysis by the two portable methods. The samples were first analyzed by XRF, and then by ASV. Calibration was verified on both instruments according to standard procedures. The samples were then sent for confirmatory analysis via flame atomic absorption (FAA) according to NlOSH method 7082. Pair-wise comparisons between the methods using the paired t-test showed no statistically significant differences between ASV and FAA (p>O.05); however, the comparison between XRF and FAA was statistically significant (p 0.93), indicating that these methods are well- suited as screening methods for airborne lead at mining sites.
Airborne-particles; Lead-compounds; Lead-dust; Monitors; Mining-industry; Workplace-monitoring; Exposure-levels; Analytical-Method; Filters
SRL; HELD; DART; DSHEFS
American Industrial Hygiene Conference and Exposition, June 1-6, 2002, San Diego, California