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Metal concentration and bioaccessibility in different particle sizes of dust and aerosols to refine metal exposure assessment

2016; Elsevier BV; Volume: 317; Linguagem: Inglês

10.1016/j.jhazmat.2016.05.083

1873-3336

Sylvaine Goix, Gaëlle Uzu, Priscia Oliva, Fiorella Barraza, Aude Calas, Sylvie Castet, David Point, Jérémy Masbou, Jean‐Louis Duprey, Carlos Huayta, J. Chincheros, Jacques Gardon,

Air Quality and Health Impacts

Refined exposure assessments were realized for children, 7-9yrs, in the mining/smelting city of Oruro, Bolivia. Aerosols (PM>2.5, PM1-2.5, PM0.4-1 and PM0.5) and dust (separated in different particle size fractions: 2000-200μm, 200-50μm, 50-20μm, 20-2μm and <2μm) were sampled on football fields highly frequented by children in both the mining and smelting areas. Trace element concentrations (Ag, As, Cd, Cu, Pb, Sb, Sn and Zn) in each size fraction of dust and aerosols, lung bioaccessibility of metals in aerosols, and gastric bioaccessibility of metals in dust were measured. Exposure was assessed considering actual external exposure (i.e. exposure pathways: metals inhaled and ingested) and simulated internal exposure (i.e., complex estimation using gastric and lung bioaccessibility, deposition and clearance of particles in lungs). Significant differences between external and simulated internal exposure were attributed to dissemblances in gastric and lung bioaccessibilities, as well as metal distribution within particle size range, revealing the importance of both parameters in exposure assessment.