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Association of expired nitric oxide with urinary metal concentrations in boilermakers exposed to residual oil fly ash.
Kim JY; Hauser R; Wand MP; Herrick RF; Houk RS; Aeschliman BD; Woodin MA; Christiani DC
Am J Ind Med 2003 Nov; 44(5):458-466
Exposure to metal-containing particulate matter has been associated with adverse pulmonary responses. Metals in particulate matter are soluble, hence are readily recovered in urine of exposed individuals. This study investigated the association between urinary metal concentrations and the fractional concentration of expired nitric oxide (FENO) in boilermakers (N = 32) exposed to residual oil fly ash (ROFA). Subjects were monitored at a boiler overhaul site located in the New England area, USA. FENO and urine samples were collected pre- and post-workshift for 5 consecutive workdays. Metals investigated included vanadium (V), chromium (Cr), manganese (Mn), nickel (Ni), copper (Cu), and lead (Pb). The median FENO was 7.5 ppb (95% CI: 7.4-8.0), and the median creatinine-adjusted urinary metal concentrations (microg/g creatinine) were: vanadium, 1.37; chromium, 0.48; manganese, 0.30; nickel, 1.52; copper, 3.70; and lead, 2.32. Linear mixed-effects models indicated significant inverse exposure-response relationships between log FENO and the log-transformed urinary concentrations of vanadium, manganese, nickel, copper, and lead at several lag times, after adjusting for smoking status. Urine samples may be utilized as a biomarker of occupational metal exposure. The inverse association between FENO and urinary metal concentrations suggests that exposure to metals in particulate matter may have an adverse effect on respiratory health.
Biological monitoring; Metal compounds; Air contamination; Epidemiology; Particulate dust; Particulates; Urinalysis; Boiler furnaces; Fly ash; Exposure assessment; Industrial exposures
Harvard School of Public Health, Occupational Health Program, 665 Huntington Avenue, Building I, Room 1402, Boston, MA 02115
7440-02-0; 10102-43-9; 7440-62-2; 7440-47-3; 7440-50-8; 7439-92-1; 7439-96-5
Grant-Number-K01-OH-000152; Grant-Number-T42-CCT-110421; Grant-Number-T42-CCT-122961
Issue of Publication
American Journal of Industrial Medicine
Harvard University, Boston, Massachusetts
Page last reviewed: April 9, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division