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Workplace performance assessment of half-facepiece respirators in isocyanate-exposed body shop workers: the spray study.

Liu-Y; Sparer-J; Stowe-M; Walsh-F; Holm-C; Redlich-C; Cullen-M; Bello-D; Young-F; Woskie-F; Streicher-R
American Industrial Hygiene Conference and Exposition, May 10-15, 2003, Dallas, Texas. Fairfax, VA: American Industrial Hygiene Association, 2003 May; :53-54
Little has been conducted to evaluate workplace performances of respirators in auto body shops. This study was designed to assess the workplace protection factor (WPF) of halffacepiece cartridge respirators with paint filters in spray paintings as part of the Yale SPRAY study. Twenty-two auto body shops participated in the assessment with 30 inside-outside respirator sample pairs collected. Respirators assessed were from 3M and Survivair companies as used by shop workers. Air sampling and analysis was performed according to the NIOSH MAP draft method. The ambient air samples were collected using a 25-mm 10M sampler with a single quartz fiber filter operated at 2 l/min. The inside-respirator samples were taken using a Delrin cassette and the same filter with a probe mounted into the respirator facepiece. Filters were impregnated with 500ug MAP and field extracted with 10 ml 1x10-4 M MAP in acetonitrile. Samples were analyzed on HPLC. The monomer (ug/m3) of hexamethylene diisocyanate (HDI), and oligomers (ug/m3 ) of HDI and isophorone diisocyanate (IPDI) were quantified and total number of isocyanate reactive groups (TRIG: ugNCO/m3) calculated. WPF was calculated as the ambient concentration divided by the inside-respirator concentration. Results showed that geometric mean (geometric standard deviation) and range of WPF were 17.8 (5.1) and 1.0 to 204.0 for HDI monomer, 310.5 (6.9) and 6.8 to 9777.0 for HDI oligomers, 233.9 (12.2) and 1.0 to 85783.0 for IPDI oligomers, and 274.2 (6.0) and 0.6 to 5335.2 for TRIG. Average WPF of TRIG was 253.8 (6.5) for clear coating (N=25) and 403.8 (4.3) for priming (N=5) tasks without statistical significance. No significant difference was observed of WPF between respirator brands. These results provided essential data for assigning protection factors to these respirators when used in spray operations and for adjusting internal exposures to isocyanates in the SPRAY epidemiologic study of health effects.
Respirators; Workers; Workplace-monitoring; Workplace-studies; Isocyanates; Occupational-exposure; Automobile-repair-shops; Air-sampling; Sampling; Respiratory-protective-equipment; Mechanics
822-06-0; 4098-71-9
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Research Tools and Approaches: Exposure Assessment Methods
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American Industrial Hygiene Conference and Exposition, May 10-15, 2003, Dallas, Texas