污灌区稻田汞污染特征及健康风险评价

被引：34

作者：

郑顺安 ^{[1
,2
]}

唐杰伟 ^{[1
]}

郑宏艳 ^{[2
]}

薛颖昊 ^{[1
]}

郑向群 ^{[2
]}

机构：

[1] 农业部农业生态与资源保护总站农产品产地环境评价中心

[2] 农业部环境保护科研监测所

来源：

中国环境科学 | 2015年 / 35卷 / 09期

关键词：

污灌区; 水稻; 汞; 甲基汞; 暴露风险;

D O I：

暂无

中图分类号：

X53 [土壤污染及其防治]; X82 [环境质量分析与评价];

学科分类号：

083001 [环境科学];

摘要：

选择天津北排污河灌区作为研究区域,调查了土壤和水稻总汞和甲基汞的含量及分布特征,评估污灌区稻米食用汞暴露风险,并对污灌区土壤-稻米甲基汞的影响因素进行了初步分析.结果表明,1.调查的29个污灌区稻田,土壤总汞含量为(367.04±129.36)μg/kg,显著高于区域土壤Hg背景值73μg/kg,甲基汞含量为(0.87±0.77)μg/kg;水稻各部位总汞含量依次为稻叶>稻根>稻茎>稻米,稻米总汞含量为(12.80±5.14)μg/kg,甲基汞含量依次为稻米>稻根>稻茎>稻叶,稻米对甲基汞具有很强的富集能力,甲基汞含量为(2.09±1.20)μg/kg,甲基化率均值超过10%.污灌区稻米总汞每周摄入量为0.068～1.25μg/(kg·bw),甲基汞每周摄入量为0.0095～0.49μg/(kg·bw),污灌区稻米总汞及甲基汞暴露对居民健康风险总体仍在安全阈值内,但个别汞污染较严重地块甲基汞暴露风险值得高度关注.土壤甲基汞含量仅与土壤总汞含量及黏粒含量的相关性达到显著性水平,稻米甲基汞含量与土壤总汞含量、土壤甲基汞含量、稻米总汞含量及黏粒含量的相关性达到显著性水平.

引用

页码：2729 / 2736

页数：8

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