| 洞庭湖沉积物腐殖酸的配位性与酸碱性 |
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| 引用本文： | 曾蕾,易诚,周崇文,陈科.洞庭湖沉积物腐殖酸的配位性与酸碱性[J].灌溉排水学报,2010,29(1). |
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| 作者姓名： | 曾蕾 易诚 周崇文 陈科 |
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| 作者单位： | 湖南环境生物学院,精密仪器中心,湖南,衡阳,421005 |
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| 基金项目： | 国土资源部科技司自由选题项目(992008) |
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| 摘 要： | 通过电位滴定研究了从洞庭湖沉积物中分离得到的腐殖酸(HA)的酸碱性和配位性,采用修正格兰函数进行了数据拟合。表征了6类可滴官能团含量和分布,pKa数值在2.35~10.50之间,羧基占可电离中心总数的62%,利用铜离子选择电极和汞齐电极(Pb、Cd和Zn)研究了腐殖酸与Cu2+、Pb2+、Cd2+和Zn2+配位性质,借助Scatchard方法对数据进行了处理,显示铜和铅为二配体,镉和锌为单配体。平均稳定常数顺序为:logKHA-CulogKHA-PblogKHA-CdlogKHA-Zn,配位能力顺序为:PbCuCd≈Zn。
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| 关 键 词： | 腐殖酸 酸碱滴定 配位能力 稳定常数 |
Properties of Humic Acid in Sedimentary from Dong-Ting Lake on Complexation and Acid-Basicity |
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| ZENG Lei,YI Cheng,ZHOU Chong-wen,CHEN Ke.Properties of Humic Acid in Sedimentary from Dong-Ting Lake on Complexation and Acid-Basicity[J].Journal of Irrigation and Drainage,2010,29(1). |
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| Authors: | ZENG Lei YI Cheng ZHOU Chong-wen CHEN Ke |
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| Institution: | Hunan Environment & Biologic Polytechnic;Hengyang 421005;China |
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| Abstract: | Complexation and acid-base properties of humic acid isolated from sediment below Dong-Ting Lake were studied by potentiometric titration,adopting the modified Gran functions for data fitting.Six classes of titratable groups were characterized.Carboxylic groups accounted for 66% of the total of ionizable sites.The complexing properties were studied with regard to Cu2+,Pb2+,Cd2+ and Zn2+ ions by potentiometric titration using Cu ion selective electrode,or amalgam electrodes(Pb,Cd and Zn).The data treatment by... |
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| Keywords: | humic acid acid-base titrimetry complexation capacity stability constants |
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