%0 Journal Article
%T Characteristics of soil humic acid dissociation and its complexation with copper<br>土壤胡敏酸的解离及其与Cu2+的络合特征
%A YANG Yati
%A ZHANG Yiping
%A <br>杨亚提
%A 张一平
%J 环境科学学报
%D 2001
%I 
%X Potentiometric titration and CCM were performed the study on humic acid extracted from soils.Results showed that humic acid is a mixture of two monoprotic acids and it fits the electrostatic model in CCM at pH3-7 .The dissociation constants and Cu complexation constants were determined by the optimization procedure in the computer program FITEQL32.The dissociation constants p KpKHL1 is in the range of 3.50 to 4.89, p K HL2 6.17 to 8.38, pKHL1 / pKHL2 is below 105, which is consistant with the results of potentiometric titration curve. The Cu2+ complexation constant,is 1.346 for old manured loessal soil and 2.241 for dark cultivated loessal soil.A good optimization result is given by nonelectrostatic model.
%K Cu2+<br>土壤
%K 胡敏酸
%K 电位滴定
%K 解离常数
%K 络合常数
%K 铜离子
%K 污染监测
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=80794598721D2647&yid=14E7EF987E4155E6&vid=659D3B06EBF534A7&iid=B31275AF3241DB2D&sid=507521DBC725630F&eid=FA98B938D085B826&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=4&reference_num=11