title: The association of expired nitric oxide with occupational particulate metal exposure.
abstract: Toxicologic studies have shown that soluble transition metals in residual oil fly ash (ROFA) can induce pulmonary injury. In this study, we investigated the association between the fractional concentration of expired nitric oxide (FENO) and exposure to metal constituents of particulate matter with an aerodynamic mass median diameter < or =2.5 microm (PM2.5) in boilermakers exposed to ROFA and metal fume. Metals investigated included vanadium, chromium, manganese, nickel, copper, and lead. Subjects were monitored for 5 consecutive days during boiler repair overhauls in 1999 (n=20) and 2000 (n=14). In 1999, we found a significant inverse association between log-transformed FENO and PM2.5 metal concentrations. LogFENO changed by -0.03 (95% CI: -0.04, -0.01), -0.56 (95% CI: -0.88, -0.24), -0.09 (95% CI: -0.16, -0.02), and -0.04 (95% CI: -0.07, -0.02) per microg/m3 of PM2.5 vanadium, chromium, manganese, and nickel, respectively. In 2000, no significant associations were observed, most likely due to exposure misclassification resulting from the use of respirators. The inverse association between PM2.5 metal exposure and FENO in subjects with limited respirator usage suggests that soluble transition metals might be partially responsible for the adverse pulmonary responses seen in workers exposed to ROFA.
authors.affiliation: Occupational Health Program, Department of Environmental Health, Harvard School of Public Health, Boston, MA 02115, USA.
authors.forename: Jee Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Russ
authors.initials: R
authors.lastname: Hauser
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Wand
authors.forename: Robert F
authors.initials: RF
authors.lastname: Herrick
authors.forename: Chitra J
authors.initials: CJ
authors.lastname: Amarasiriwardena
authors.forename: David C
authors.initials: DC
authors.lastname: Christiani
mesh_terms: D000293:Adolescent; D000328:Adult; D001944:Breath Tests; D016166:Free Radical Scavengers / Q000032:analysis*; D000075322:Heavy Metal Poisoning; D006801:Humans; D007221:Industry; D008168:Lung / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000032:analysis*; D016273:Occupational Exposure; D010316:Particle Size; D011210:Power Plants; D012119:Respiration; D028561:Transition Elements
chemical_list: D016166:Free Radical Scavengers; D028561:Transition Elements; D009569:Nitric Oxide