| Ultraviolet absorbance titration for the determination of conditional stability constants of Hg（Ⅱ） and dissolved organic matter |
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| 作者姓名： | BAI Yingchen WU Fengchang WAN Guojing LIU Congqiang FU Pingqing LI Wen |
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| 作者单位： | BAI Yingchen1，2，WU Fengchang1，WAN Guojiang1，LIU Congqiang1，FU Pingqing1，and LI Wen1 1 The State Key Laboratory of Environmental Geochemistry，Institute of Geochemistry，Chinese Academy of Sciences，Guiyang 550002，China 2 Graduate School of Chinese Academy of Sciences，Beijing 100039，China |
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| 基金项目： | 国家自然科学基金，the International Cooperation Project of the Chinese Academy of Sciences |
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| 摘 要： | Strong interaction between natural dissolved organic matter （DOM） and Hg（Ⅱ） may influence the transport, conversion, toxicity and bio-validity of mercury in the environment. In this paper ultraviolet （UV） absorbance titration was employed for the first time for the determination of the conditional stability constants of Hg（Ⅱ） and （DOM）. With increasing Hg（Ⅱ） concentrations, the UV absorbance of fulvic acid, humic acid, and DOM in river increases progressively. By linear and non-linear model fitting, the conditional stability constants （lgK） of Hg（Ⅱ） and DOM were worked out to be 3.54-4.93 and 3.64-4.85, respectively. The results are consistent with those acquired by the typical fluorescence quenching titration method, with the maximum relative error of lgK being 2.6% and the average relative error being 0.2%. The UV absorbance titration method has the advantages of rapid determination, simple performance, and it will probably become a new approach to studying interactions between DOM and trace metallic ions.
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| 关 键 词： | 紫外线 稳定性 汞 有机物 |
| 收稿时间： | 2006-10-16 |
| 修稿时间： | 2007-03-27 |
Ultraviolet absorbance titration for the determination of conditional stability constants of Hg(II) and dissolved organic matter |
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| BAI Yingchen WU Fengchang WAN Guojing LIU Congqiang FU Pingqing LI Wen.Ultraviolet absorbance titration for the determination of conditional stability constants of Hg(II) and dissolved organic matter[J].Chinese Journal of Geochemistry,2008,27(1):46-52. |
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| Authors: | Yingchen Bai Fengchang Wu Guojiang Wan Congqiang Liu Pingqing Fu Wen Li |
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| Institution: | (1) The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China |
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| Abstract: | Strong interaction between natural dissolved organic matter (DOM) and Hg(II) may influence the transport, conversion, toxicity and bio-validity of mercury in the environment. In this paper ultraviolet (UV) absorbance titration was employed for the first time for the determination of the conditional stability constants of Hg(II) and (DOM). With increasing Hg(II) concentrations, the UV absorbance of fulvic acid, humic acid, and DOM in river increases progressively. By linear and non-linear model fitting, the conditional stability constants (lgK) of Hg(II) and DOM were worked out to be 3.54-4.93 and 3.64-4.85, respectively. The results are consistent with those acquired by the typical fluorescence quenching titration method, with the maximum relative error of lgK being 2.6% and the average relative error being 0.2%. The UV absorbance titration method has the advantages of rapid determination, simple performance, and it will probably become a new approach to studying interactions between DOM and trace metallic ions. |
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| Keywords: | ultraviolet absorbance titration fluorescence quenching titration dissolved organic matter conditional stability constant mercury |
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