わが国におけるヒ素を含む土壌・地下水からの暴露とリスクの推定

Abstract

The exposure rates, the distribution of exposure paths and the risk level of inorganic arsenic containing in soil and groundwater in Japan have been evaluated by using originally developed risk assessment model.Major exposure path for human to arsenic in Japan was food intake. The average total exposure rate was estimated about 4×10-1 to 5×10-1 (95% confidence interval (CI)), which revealed that the skin cancer risk resulting from oral intake was about 6×10-4 to 7×10-4 (95%CI) and the lung cancer risk resulting from inhalation intake was about 2×10-4 to 2×10-3 (95%CI). The total exposure rates from soil and groundwater paths were about 3×10-3 to 5×10-2 (95%CI), which revealed that the average oral and inhalation cancer risk (95%CI) was evaluated at 4×10a-6 to 8×10-5 and 1×10-5 to 2×10-4, respectively.The contaminated area where soil concentration was higher than Japanese criteria of total content in soil (150mg/kg) had the oral cancer risk more than 5×10-4 to 1×10-3 (95%CI) and the inhalation cancer risk 2×10-3. The risk level of contaminated area exceeded groundwater criteria (10μg/l ) was estimated at about 3×10-5 to 8×10-5 (95%CI).