| 土壤胡敏酸的解离及其与Cu2+的络合特征 |
| |
| 引用本文： | 杨亚提,张一平.土壤胡敏酸的解离及其与Cu2+的络合特征[J].环境科学学报,2001,21(6):731-736. |
| |
| 作者姓名： | 杨亚提 张一平 |
| |
| 作者单位： | 1. 西北农林科技大学生命科学学院,
2. 西北农林科技大学资源与环境学院, |
| |
| 摘 要： | 通过电位滴定法及恒定容量模式（CCM）研究了2种土壤胡敏酸的解离特性及其与Cu^2 的络合特征，结果证明在pH3－7范围内胡敏酸表现为2种一元酸组成的混合酸，实验数据适用于静电模式。胡敏酸的解离常数和Cu^2 的络合常数应用计算机程序FITEQL32表明，优化的解离常数pKHL1在3．50－4．89之间，pKHL2在6．17－8．38之间，2种形态一元胡敏酸解离常数之比小于10^5，与滴定曲线只有一个突跃区相一致。2种土壤胡敏酸与Cu^2 络合常数logK^intACu大小分别为Lou土HA1．346，黑垆土HA2．241，非静电模式的优化结果较好。
|
| 关 键 词： | 土壤 胡敏酸 电位滴定 解离常数 络合常数 铜离子 污染监测 |
| 文章编号： | 0253-2468(2001)-06-0731-06 |
| 收稿时间： | 2000/12/18 0:00:00 |
| 修稿时间： | 2000年12月18 |
Characteristics of soil humic acid dissociation and its complexation with copper |
| |
| YANG Yati and ZHANG Yiping.Characteristics of soil humic acid dissociation and its complexation with copper[J].Acta Scientiae Circumstantiae,2001,21(6):731-736. |
| |
| Authors: | YANG Yati and ZHANG Yiping |
| |
| Institution: | College of Life Science and College of Resource and Environment Science of Northwest Science & Technology University of Agriculture & Forestry, Yangling, Shaanxi 712100 |
| |
| Abstract: | 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. |
| |
| Keywords: | Cu2+ |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《环境科学学报》浏览原始摘要信息 |
| 点击此处可从《环境科学学报》下载免费的PDF全文 |
