Seasonal varieties and influential factors of heavy metals in sediments of Wuliangsuhai Lake
Seasonal varieties and influential factors of heavy metals in sediments of Wuliangsuhai Lake
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乌梁素海沉积物重金属季节变化及影响因素
DOI：
10.2166/ws.2020.122
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发表时间：
2020-06
期刊：
影响因子：
1.7
通讯作者：
Hong Ma
中科院分区：
文献类型：
--
作者：
Weidong Tian;Guoxia Pei;Shengnan Zhao;Xiaohong Shi;Hanmeng Zhang;Biao Sun;Shuang Song;Chi Sun;Hong Ma
五粮素海位于中国北方，是河套灌区典型的浅湖。我们分别在春季、夏季、秋季和冬季采集了沉积物样本。测定了总砷（As）、总汞（Hg）等参数（温度、pH、EC、沉积物粒度、沉积物有机质）。通过时间变化、季节比较和因子分析，得出以下结论：(1) Hg和As的季节特征为夏季>春季>秋季>冬季，春季>夏季>秋季>冬季。(2)夏季Hg和As浓度较高的原因可能是有机质和腐殖质含量较高，使重金属被较强的吸附和络合，有机质含量的变化会增强活性较弱的有机质的结合状态，从而沉积在沉积物中。(3)汞和砷的形态也是原因，夏季大气中的汞被氧化成hg2 +，通过雨水冲刷和干沉降进入水体；然后，可溶性的Hg2þ被迅速吸附并固定在沉积物中，一系列的转化降低了它的活性。As3þ被氧化为As5þ，形成沉淀。因此，夏季沉积物中Hg、As含量、汞的环境风险和潜在生态风险较高。doi: 10.2166/ws.2020.122://iwaponline.com/ws/article-pdf/20/8/3779/814154/ws020083779.pdf田卫东，国霞，赵胜南（通讯作者）石晓红，史彪，孙爽，马松红，内蒙古农业大学水利与土木工程学院，内蒙古呼和浩特010018zhaoshengnan2005@163.com内蒙古水利水电勘测设计院，呼和浩特010020孙奇郑州工业大学，郑州450044
Wuliangsuhai Lake, as a typical shallow lake in Hetao irrigation district, is located in Northern China. We took sediment samples in spring, summer, autumn, and winter, respectively. The total arsenic (As), total mercury (Hg) and other parameters (temperature, pH, EC, particle size of sediments and organic matter in sediments) were measured. Based on the temporal variations, seasonal comparisons and factor analysis, the following conclusions were obtained. (1) The seasonal characteristics of Hg and As were: summer> spring> autumn>winter, and spring> summer> autumn>winter. (2) The higher concentration of Hg and As during summer was considered to be caused by the higher organic matter and humus content, which made heavy metals strongly adsorbed and complexed, and changes in the organic matter content would enhance the binding state of the less active organic matter then deposit in sediment. (3) The speciation of mercury and arsenic was also the reason, in summer, the Hg in the atmosphere was oxidized to Hg2þ, entering into water through rainwater washing and dry deposition; then, soluble Hg2þ was quickly adsorbed and fixed in sediment, a series of transformations reduces its activity. The As3þ would be oxidized to As5þ which would form precipitated. Therefore, the content of Hg and As, environmental risk and potential ecological risk of mercury in sediments were higher in summer. doi: 10.2166/ws.2020.122 ://iwaponline.com/ws/article-pdf/20/8/3779/814154/ws020083779.pdf Weidong Tian Guoxia Pei Shengnan Zhao (corresponding author) Xiaohong Shi Biao Sun Shuang Song Hong Ma College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China E-mail: zhaoshengnan2005@163.com Hanmeng Zhang Inner Mongolia Water Conservancy and Hydropower Survey and Design Institute, Hohhot 010020, China Chi Sun Zhengzhou University of Technology, Zhengzhou 450044, China
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