title: Exhaled breath condensate as a suitable matrix to assess lung dose and effects in workers exposed to cobalt and tungsten.
abstract: The aim of the present study was to investigate whether exhaled breath condensate (EBC), a fluid formed by cooling exhaled air, can be used as a suitable matrix to assess target tissue dose and effects of inhaled cobalt and tungsten, using EBC malondialdehyde (MDA) as a biomarker of pulmonary oxidative stress. Thirty-three workers exposed to Co and W in workshops producing either diamond tools or hard-metal mechanical parts participated in this study. Two EBC and urinary samples were collected: one before and one at the end of the work shift. Controls were selected among nonexposed workers. Co, W, and MDA in EBC were analyzed with analytical methods based on mass spectrometric reference techniques. In the EBC from controls, Co was detectable at ultratrace levels, whereas W was undetectable. In exposed workers, EBC Co ranged from a few to several hundred nanomoles per liter. Corresponding W levels ranged from undetectable to several tens of nanomoles per liter. A parallel trend was observed for much higher urinary levels. Both Co and W in biological media were higher at the end of the work shift in comparison with preexposure values. In EBC, MDA levels were increased depending on Co concentration and were enhanced by coexposure to W. Such a correlation between EBC MDA and both Co and W levels was not observed with urinary concentration of either element. These results suggest the potential usefulness of EBC to complete and integrate biomonitoring and health surveillance procedures among workers exposed to mixtures of transition elements and hard metals. Key words: cobalt, exhaled breath condensate, hard metals, lung, malondialdehyde, oxidative stress, tungsten.
authors.affiliation: National Institute of Occupational Safety and Prevention, Research Centre at the University of Parma, Parma, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Goldoni
authors.forename: Simona
authors.initials: S
authors.lastname: Catalani
authors.forename: Giuseppe
authors.initials: G
authors.lastname: De Palma
authors.forename: Paola
authors.initials: P
authors.lastname: Manini
authors.forename: Olga
authors.initials: O
authors.lastname: Acampa
authors.forename: Massimo
authors.initials: M
authors.lastname: Corradi
authors.forename: Roberto
authors.initials: R
authors.lastname: Bergonzi
authors.forename: Pietro
authors.initials: P
authors.lastname: Apostoli
authors.forename: Antonio
authors.initials: A
authors.lastname: Mutti
mesh_terms: D000328:Adult; D001944:Breath Tests; D016022:Case-Control Studies; D003035:Cobalt / Q000032:analysis* / Q000652:urine; D004784:Environmental Monitoring; D005260:Female; D006801:Humans; D008297:Male; D016273:Occupational Exposure; D018384:Oxidative Stress; D012680:Sensitivity and Specificity; D014414:Tungsten / Q000032:analysis* / Q000652:urine
chemical_list: D003035:Cobalt; D014414:Tungsten