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Worker exposure to volatile organic compounds in the vehicle repair industry.

Authors
Wilson-MP; Hammond-SK; Nicas-M; Hubbard-AE
Source
J Occup Environ Hyg 2007 Mar; 4(5):301-310
NIOSHTIC No.
20037256
Abstract
This study evaluated exposures among vehicle repair technicians to hexane, acetone, toluene, and total volatile organic compounds (VOCs). On randomly selected workdays, we observed a characteristic pattern of solvent use among 36 technicians employed in 10 repair shops, each of which used an aerosol solvent product. We obtained quantitative exposure measurements from a subset of nine technicians (employed in three of these shops) who used an aerosol product containing hexane (25-35%), acetone (45-55%), and toluene (5-10%). The time-weighted average (TWA) exposure concentration for task-length breathing zone (BZ) samples (n = 23) was 36 mg/m3 for hexane, 50 mg/m3 for acetone, and 10 mg/m3 for toluene. The TWA area concentrations (n = 49) obtained contemporaneously with BZ samples ranged from 25% to 35% of the BZ concentrations. The solvent emission rate (grams emitted/task time) was correlated with the total VOC exposure concentration (R2 = 0.45). The proportions of VOCs in the BZ samples were highly correlated (r = 0.89 to 0.95) and were similar to those of the bulk product. Continuous exposure measurements for total VOCs (n = 1238) during 26 tasks produced a mean BZ VOC "pulse" of 394 mg/m3 within 1 min following initiation of solvent spraying. The geometric mean air speed was 5.2 meters/min in the work areas (n = 870) and was associated with 0.8 air changes per minute in the BZ. The findings suggest that vehicle repair technicians who use aerosol solvent products experience episodic, inhalation exposures to the VOCscontained in these products, and the proportions ofVOCs in the breathing zone are similar to those of the bulk product. Because acetone appears to amplify the severity and duration of the neurotoxic effects of n-hexane, products formulated with both hexane and acetone should be avoided. Further evaluation of exposures to VOCs is needed in this industry, along with information on effective alternatives to aerosol solvent products.
Keywords
Aerosol-particles; Aerosols; Biological-effects; Chemical-deposition; Chemical-hypersensitivity; Chemical-properties; Demographic-characteristics; Exposure-assessment; Exposure-levels; Exposure-methods; Fumes; Immune-reaction; Immunochemistry; Inhalants; Inhalation-studies; Injury-prevention; Mechanical-cleaning; Mechanics; Medical-surveys; Medical-treatment; Nervous-system-disorders; Neurological-reactions; Neurological-system; Neurotoxic-effects; Neurotoxicity; Neurotoxins; Occupational-exposure; Occupational-hazards; Organic-chemicals; Physiological-effects; Physiological-response; Quantitative-analysis; Risk-analysis; Risk-factors; Solvents; Solvent-vapors; Statistical-analysis; Work-areas; Work-environment; Work-practices; Author Keywords: automotive repair; exposure assessment; hexane; organic solvents; volatile organic compounds
Contact
Michael P. Wilson, School of Public Health, 140 Earl Warren Hall #7360, University of California Berkeley, Berkeley, CA 94720-7360
CODEN
JOEHA2
Publication Date
20070301
Document Type
Journal Article
Email Address
mpwilson@berkeley.edu
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008429
Issue of Publication
5
ISSN
1545-9624
Source Name
Journal of Occupational and Environmental Hygiene
State
CA
Performing Organization
University of California, Berkeley
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