| 厦门港湾潮间带沉积物中汞的赋存形态及其释放动力学 |
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| 引用本文： | 王继纲,陈金民.厦门港湾潮间带沉积物中汞的赋存形态及其释放动力学[J].台湾海峡,2011,30(3):310-315. |
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| 作者姓名： | 王继纲 陈金民 |
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| 作者单位： | 1. 国家海洋局第三海洋研究所,福建厦门361005;厦门大学海洋与环境学院,福建厦门361005
2. 国家海洋局第三海洋研究所,福建厦门,361005 |
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| 基金项目： | 国家海洋局第三海洋研究所基本科研业务费专项资金资助项目(海三科2009022) |
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| 摘 要： | 所研究的沉积物样品采自福建省厦门市的港湾潮问带地区，选择了10μg／dm’的汞标准使用液对采集回来的沉积物样品进行了预污染处理，利用预污染后的沉积物样品，在实验室中进行了一系列的汞释放动力学实验．实验结果表明，汞的释放量较低，达到释放平衡时的释放量小于5μg／kg，释放过程可分为2个阶段：前8h为快速释放阶段，之后为慢速释放阶段，大约在24h达释放平衡．采用了Tessier五步提取法对未污染过的沉积物原样及进行过预污染处理的沉积物样品进行了汞的形态分析，结果表明通过污染实验吸附到沉积物上的汞的各形态含量大小顺序为：HgS为主的惰性汞〉单质汞〉盐酸溶无机汞及甲基汞〉有机结合、螯合态汞〉水溶态、交换态等活性汞．
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| 关 键 词： | 海洋化学 汞 潮间带沉积物 释放动力学 形态 厦门港湾 |
Release kinetics and speciation of mercury in the intertidal sediments of Xiamen Harbor |
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| WANG Ji-gang,CHEN Jin-min.Release kinetics and speciation of mercury in the intertidal sediments of Xiamen Harbor[J].Journal of Oceanography In Taiwan Strait,2011,30(3):310-315. |
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| Authors: | WANG Ji-gang CHEN Jin-min |
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| Institution: | WANG Ji-gang1,2,CHEN Jin-min1(1.Third Institute of Oceanography,SOA,Xiamen 361005,China,2.College of Oceanography and Environmental Science,Xiamen University,China) |
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| Abstract: | Sediment was sampled from the coastal intertidal sediment of Xiamen harbor,Fujian,China.According to the recent status of mercury pollution in China and other countries,and with reference to China’s national standards for mercury emissions in industrial waste water(≤50 μg/dm3),we selected a 10 μg/dm3 mercury solution to spike the intertidal sediment.The dynamics of mercury release in intertidal sediment was investigated and revealed that mercury release was<5 μg/kg when equilibrium was reached,a relatively low release quantity.The dynamics of mercury release was biphasic: the quick-releasing phase occurred within 8 h,and the later slow-releasing phase until equilibrium at approximately 24 h.Elovich and Freundlich equations were used to fit the mercury releasing kinetics and attained correlation coefficient values of 0.948 4 and 0.888 9,respectively,indicating that both equations fit well,with the Elovich equation indicating a relatively better correlation.Using the five-step Tessier sequential extraction procedure for the speciation of particulate trace metals,we analyzed the main speciation of mercury in both original and spiked sediments.The study found that various mercury species were absorbed by the sediments at different rates,as follows: inert mercury(HgS)>elemental mercury>HCl-soluble inorganic mercury and methyl mercury>organic bound and chelated mercury>reactive mercury-like water-soluble mercury and exchangeable mercury. |
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| Keywords: | marine chemistry mercury intertidal sediment release kinetics speciation Xiamen Harbor |
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