长江流域资源与环境 >> 2017, Vol. 26 >> Issue (03): 419-427.doi: 10.11870/cjlyzyyhj201703012
向龙1, 刘平辉1,2, 杨迎亚1
XIANG Long1, LIU Ping-hui1,2, YANG Ying-ya1
摘要: 为查明华东某铀矿区稻米中放射性核素铀污染现状及健康风险问题,测定铀矿区和对照区共136件稻米样品中放射性核素U含量,采用单因子污染指数法评价放射性铀污染,并开展U元素健康风险评价。结果表明:(1)研究区稻米中U含量平均值为1.46 ng·g-1,各亚区稻米中U含量平均值从大到小顺序为:开采矿井区 > 水冶场区 > 含矿未采区 > 废弃矿井区 > 江西省背景值 > 对照区;(2)稻米单因子污染指数为1.25,属于轻度污染。其中,开采矿井区和水冶厂区为轻度污染,废弃矿井区和对照区未受污染;(3)首次计算提出江西省大米U元素致癌风险最大斜率系数为1.04×103(d·kg)·mg-1。各亚区稻米中成人和儿童致癌风险指数高低顺序均为:开采矿井区 > 水冶厂区 > 含矿未采区 > 废弃矿井区 > 对照区。儿童直接饮食稻米具有一定的致癌风险;开采矿井区和水冶厂区的成人存在一定致癌风险,含矿未采区和废弃矿井区以及对照区均无致癌风险。
中图分类号:
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