中文摘要：

铜在环境介质中的迁移转化及生物有效性受到许多复杂环境因子的影响，其中溶解有机质（DOM）扮演着重要作用。铜与DOM的络合机理是研究铜在水中迁移转化规律的基础。采用离子选择电极法研究铜离子和溶解性有机质胡敏酸（HA）的络合行为，测定不同条件（HA浓度、pH值、离子强度）下HA的络合能力。采用Van Den Berg．Ruzic曲线以及Scatchard曲线（1：1离散单配位体模型）确定金属铜离子与HA的条件络合稳定常数，并在此基础上探讨络合常数的影响因子。结果显示：pH值升高，络合稳定常数增大，络合稳定性增强；腐殖酸浓度升高，络合稳定常数减小，络合稳定性降低；离子强度增大，络合稳定常数减小，络合稳定性降低。对IgK值与DOM浓度、pH值、离子强度进行相关分析，发现IgK值与DOM浓度和pH值显著相关，表明络合常数并非为常数值。

英文摘要：

Many environmental factors affect the migration and transformation as well as bioavailability of copper in environmental media. Dissolved organic matter （DOM） plays an important role in the environment whilst forming stable complex compounds with metal ions to make the regulatory effect on migration, transformation, toxicity and biological effect of heavy metals. Ion-selective electrode method was used to determine the complexing behaviour of copper ions with DOM under different conditions such as various humic acid （HA） concentration, pH values and ionic strength. Van den Berg-Ruzic curve and Scatchard curve （an 1：1 discrete single ligand model） were chosen to fit the complexing stability constants, meanwhile their impact factors were discussed. The results showed that the complexing stability constants would be decreasing along with descending pH value, increasing HA content, or rising ionic strength. Correlation analysis found that IgK was correlated significantly with DOM concentration and pH value indicating that the complexing constant was really not a constant value.