研究论文
曹军,李本纲,徐福留,陶澍,林健枝.水体与土壤中天然有机物与铜的络合作用及其影响因素[J].环境科学学报,2001,21(6):726-730
水体与土壤中天然有机物与铜的络合作用及其影响因素
- Complexation of copper(Ⅱ)ions with natural organic matter in water and soil in Hong Kong
- 基金项目：国家杰出青年基金(49525102);国际铜协会(TPT0604)资助项目
- 作者
- 单位
- 曹军
- 北京大学城市与环境学系,北京 100871
- 李本纲
- 北京大学城市与环境学系,北京 100871
- 徐福留
- 北京大学城市与环境学系,北京 100871
- 陶澍
- 北京大学城市与环境学系,北京 100871
- 林健枝
- 香港中文大学,地理系
- 摘要：采用络合滴定方法测定了不同反应条件下水体DOC和土壤WSOC与铜的络合参数.比较了土壤WSOC与FA、HA及与水体DOC络合参数的差异.实验结果表明:pH降低,络合稳定常数下降;滴定浓度范围降低,测定络合条件稳定常数升高;离子强度上升,络合稳定常数相应下降.2个样的WSOC络合稳定常数测定结果分别为4.66和4.64,高于水体DOC;络合容量分别为0.079和0.023mmol(Cu)mg(C),低于DOC.考虑到络合位初始浓度与其他因素的影响,WSOC与FA和HA样品的络合能力相差不大.
- Abstract：Conditional stability constants and complexation capacities of dissolved organic carbon(DOC) from river water and water soluble organic carbon(WSOC) from soil in Hong Kong for copper were determined.The results showed that the measured conditional stability constants decreased with the decrease in pH and the increase in the titration window and ionic strength.The conditional stability constants of WSOC from two samples were 4.66 and 4.64 in log-units that were higher than that of DOC.The complexation capacities of the WSOC were 0.079 and 0.023mmol(Cu)/mg(C) respectively,that were lower than that of DOC.
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