Mercury contamination and health risk to crops around the zinc smelting plant in Huludao City, northeastern China
Mercury contamination and health risk to crops around the zinc smelting plant in Huludao City, northeastern China
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DOI：
10.1007/s10653-007-9083-3
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发表时间：
2007-03
影响因子：
4.2
通讯作者：
N. Zheng;Qi-chao Wang;D. Zheng
中科院分区：
文献类型：
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作者：
N. Zheng;Qi-chao Wang;D. Zheng
中国东北辽宁省葫芦岛锌厂是亚洲最大的锌厂，其冶炼活动严重污染了周边地区的土壤、水和大气。首次对葫芦岛锌厂附近8个样地的玉米、大豆、高粱、22种蔬菜及其根际土壤中的总汞含量进行了调查。玉米、大豆和高粱种子中总汞含量分别为0.008、0.006和0.057 mg kg−1，其中高粱种子中总汞含量最高，超过《食品中污染物最大限量标准》（GB 2762 -2005）的4.7倍。蔬菜的可食用部分也受到0.001-0.147 mg kg−1（干重）汞含量的污染。植物组织中THg含量的顺序为叶>根>茎>籽粒。利用相关分析，我们表明，汞在这些植物的根主要是来自土壤，和气态汞的吸收是主要途径，汞积累在叶。葫芦岛锌厂周边地区成年人通过蔬菜摄入汞的日平均和最大摄入量分别为0.015和0.051 μg/kg/d，儿童的日平均和最大摄入量分别为0.02和0.07 μg/kg/d。成人每周总汞平均摄入量和最大摄入量分别为暂定每周可耐受摄入量（PTWI）的2.1%和7.1%，儿童分别为PTWI的2.8%和9.7%。
The Huludao zinc plant in Liaoning province, northeast China was the largest in Asia, and its smelting activities had seriously contaminated soil, water and atmosphere in the surrounding area. For the first time, we investigated the total mercury (THg) content in maize, soybean, broomcorn, 22 vegetables, and the soil around their roots from eight sampling plots near the Huludao zinc plant. THg contents of the seeds of maize, soybean, and broomcorn are 0.008, 0.006, and 0.057 mg kg−1, respectively, with the broomcorn being the highest, exceeding the maximum level of contaminant in food (GB2762-2005) by 4.7 times. The edible parts of vegetables are also contaminated with a range of mercury contents of 0.001–0.147 mg kg−1(dry weight). THg contents in plant tissue decrease in the order of leaves > root > stalk > grain. Using correlation analysis, we show that mercury in the roots of these plants is mainly derived from soil, and the uptake of gaseous mercury is the predominant path by which the mercury accumulated in the foliage. The average and maximum mercury daily intake (DI) of adult around the Huludao zinc plant via consuming vegetables are 0.015 and 0.051 μg/kg/d, respectively, and those of children are 0.02 and 0.07 μg/kg/d, respectively. The average and maximum weekly intakes of total mercury for adult are 2.1 and 7.1%, respectively, of the provisional tolerable weekly intake (PTWI), and 2.8 and 9.7%, respectively, of the PTWI for children.