Evaluation of risk to human health by natural arsenic contamination in groundwater and soils from the urban area of Ouro Preto (MG).

Na avalia??o da exposi??o humana ? contamina??o natural por ars?nio (As) das ?guas subterr?neas e solos na ?rea urbana da cidade de Ouro Preto, MG), nos bairros Piedade, Taquaral, Padre Faria, Alto da Cruz, Ant?nio Dias e Barra, foram estimados, para as crian?as e adultos residentes nesses locais: (i) os valores das doses de ingest?o di?rias (DID) de As; (ii) os valores para os quocientes de risco (QRs) e (iii) o incremento da probabilidade de se desenvolver c?ncer ao longo da vida (RC), com teores m?dios de As encontrados nas ?guas subterr?neas, variando entre 10 e 77 ?g.L-1 e, nos solos, de 332,75 e 656 mg.kg-1.This study was performed so as to make an assessment of human exposure to natural contamination by arsenic (As) in groundwaters and soils in the urban area of Ouro Preto, MG), Brazil, specifically in the Piedade, Taquaral, Padre Faria, Alto da Cruz, Ant?nio Dias, and Barra neighborhoods. In this study, the following items were estimated for the children and adult residents in these locations: (i) the values of daily ingested doses (DID) of As; (ii) the values for risk quotients (QRs) and (iii) the increase of the probability of developing cancer throughout life (RC), with mean content of As found in groundwaters varying from 10 to 77 ?g.L-1 and, in the soils, from 332.75 to 656 mg.kg-1