小冶炼地区PAHs污染及其风险评价

采样分析了中国东部沿海某镇小冶炼地区多介质环境中 PAHs的浓度水平 ,发现小冶炼集中生产区内大气中 17种PAHs总浓度 (Σ PAHs)高达 4 170 ng/ m3,是区外大气中 Σ PAHs平均值的 6倍 ;该区内河及边境河流下游河水中 Σ PAHs平均为 8.17μg/ L ,远大于边境河流上游河水中的Σ PAHs平均值 (2 .17μg/ L ) ;表层水稻土中Σ PAHs平均为 15 2 mg/ kg,并随着土壤深度增加逐渐减少 ;水稻根、茎叶、籽实中Σ PAHs平均分别为 5 2 9μg/ kg、5 39μg/ kg、10 5μg/ kg。类比调查表明 ,小冶炼地区各环境介质中的 PAHs浓度均不同程度地高于文献报道值。估算了当地居民及冶炼工人经呼吸进入体内的 8种致癌 PAHs的量 ,分别达 5 30 ng/ d和 1138ng/ d。调查了小冶炼地区及其周围地区近 3a死亡人群的死因 ,发现该区死亡人群中病死比例和死于癌症比例平均分别达 32 .2 %和 2 5 .6 % ,均高于周围地区的相应值 (2 3.3%和 16 .0 % )

Assessment on the contamination and risk of PAHs in a metal smelting area

It is well known that small-scale metal smelting industry leads to heavy PAHs pollution. However, little information is available on PAHs concentrations and distribution in various environmental elements around the smelting industry and its risk to local people. A field study was performed to determine the PAHs concentrations in different environmental elements, such as air (n=6), surface water (n=5), paddy soil (n=9), and rice (n=5) in 5 villages, located in a town of the eastern China, where still exist...