| 北江沉积物汞污染现状与评价初步研究 |
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| 引用本文： | 丁小勇,陈来国,张卫东,许振成,彭晓春,商立海.北江沉积物汞污染现状与评价初步研究[J].农业环境保护,2010(2):357-362. |
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| 作者姓名： | 丁小勇 陈来国 张卫东 许振成 彭晓春 商立海 |
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| 作者单位： | [1]西南大学化学化工学院,重庆400715 [2]环境保护部华南环境科学研究所城市环境研究中心,广州510655 [3]重庆市环境科学研究院,重庆400020 [4]中国科学院地球化学研究所,贵阳550002 |
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| 基金项目： | 国家环保公益项目（200809011）;北江镉污染应急课题（0202043） |
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| 摘 要： | 为了了解北江沉积物中汞污染现状、来源并评价其污染程度，在北江流域共采集19个沉积物样，用原子吸收法（AAS）和冷原子荧光法（CVAFS）分别测定了其总汞（THg）和甲基汞（MeHg）含量，比较了甲基化率，并用污染指数法对测定结果进行了评价。结果表明，北江沉积物THg含量为73.7～3 517 ng·g^-1（干重），均值为607.6 ng·g^-1，MeHg含量为 0.392～2.384 ng·g^-1，均值为1.302 ng·g^-1，韶关冶炼厂为重要污染点源。各采样点甲基化率差异较大，进一步研究影响甲基化的因素具有重要意义。沉积物中THg、MeHg平均污染指数分别为3.04、26.04，表明均为中度污染。
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| 关 键 词： | 北江 沉积物 总汞 甲基汞 评价 |
Preliminary Study on Pollution Status and Assessment of Mercury in Sediment from the Beijiang River |
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| DING Xiao-yong,CHEN Lai-guo,ZHANG Wei-dong,XU Zhen-cheng,PENG Xiao-chun,SHANG Li-hai.Preliminary Study on Pollution Status and Assessment of Mercury in Sediment from the Beijiang River[J].Agro-Environmental Protection,2010(2):357-362. |
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| Authors: | DING Xiao-yong CHEN Lai-guo ZHANG Wei-dong XU Zhen-cheng PENG Xiao-chun SHANG Li-hai |
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| Institution: | 1.College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China; 2.Center for Research on Urban Environment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China; 3.Chongqing Academy of Environmental Science, Chongqing 400020, China; 4. Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China) |
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| Abstract: | Mercury in environment has become the major concern in recent years due to its highly toxic to human and biota. In this study, nineteen sediment samples were collected along the Beijiang River to examine concentrations and sources of mercury, as well as methylmercury. Also, the pollution levels of mercury and its compound were assessed based on comparison with other studies. Total mercury （THg） and methylmercury （MeHg） were determined by atomic absorption spectroscopy （AAS） and cold vapor atomic fluorescence spectrometers （CVAFS）, respectively. Furthermore, methylation rates were calctdated for all samples and pollution degrees of mercury in sediment were evaluated using pollution index methods. The results showed that THg concentrations in sediments ranged from 73.7 to 3 517 ng·g^-1 dry weight, with an average of 607.6 ng·g^-1, and MeHg concentrations ranged from 0.392 to 2.384 ng·g^-1 dry weight, with an average of 1.302 ng·g^-1, respectively. Clearly, wastewater from Shaoguan smelting factory was an important point source for mercury in sediment. In addition, methylation rates varied significantly among samples, suggesting that factors influencing methylation is still unclear. Thus, more studies are needed to explore the relationships between these important factors and methylation rates of mercury in sediment. Based on the average pollution index of THg（F=3.04 ） and MeHg（F=26.04） in sediment, the Beijiang River suffered from medium pollution of THg and MeHg. |
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| Keywords: | the Beijiang River sediment total mercury methylmercury assessment |
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