2005年中国气态α HCH的人体暴露和健康风险分析

为评估由我国大气中α HCH所导致的人体健康风险,利用CanMETOP 模拟的2005年日均α HCH大气浓度,基于吸入因子和致癌风险进行研究。结果表明年吸入因子呈东部>西部,北部>南部的特征，东中和东北部地区的吸入因子分别主要由人口密度和α HCH大气浓度贡献，东中和东南部地区的个体健康损失小于东北地区，东中和东南部地区年内逐月吸入因子分配较为均匀,而东北地区主要集中的夏季，东北地区个体致癌风险系数明显高于中部和南部。推测由其它污染物所形成的暴露风险具有类似的时空分布。加之夏季东北地区集中降水所形成的湿沉降以及气温升高等因素,使摄食暴露和皮肤接触暴露增大,东北地区人群的复合暴露风险将显著大于其它地区

ANALYSIS OF HUMAN EXPOSURE AND HEALTH RISK OF ATMOSPHERIC Α-HCH IN 2005 IN CHINA

For the assessment of the impact of health risk caused by α-HCH in the atmosphere,use daily concentrations of α-HCH in atmospheric of 2005 which was simulated by CanMETOP to do the studies which based on inhalation factors and cancer risk.The result shows annual α-HCH intake fraction has a geographical features which is eastern>western,northern>southern.The intake fractions of middle-east and northeast regions are mainly contributed by population density and α-HCH concentrations in the atmosphere.The individual health loss in east and southeast are less than in northeast.The monthly distribution of intake fraction in middle-east and southeast are more equable,but in the northeast region it is mainly in summer.The coefficient of individual cancer risk in northeast region was significantly higher than the central and south.Based on the analysis above we can get a conclusion that the exposure risk which caused by other pollutants has similar temporal and spatial distribution.Besides the factors such as the wet deposition and the rise of temperature which caused by precipitation in summer of northeast region,these make feeding exposure and skin contact exposure increasing,so the compound exposure of northeast population will be significantly higher than other areas.