Copper complexing capacity as an indicator for the evaluation of water quality

建立并发表了测定河水中可溶性铜(II)络合物稳定性的方法(分析科学，8571(1992))。该方法基于只有通过铜(II)络合物解离形成的铜(II)离子才能吸附到络合柱上的现象。络合物的稳定性定义为对铜(II)离子的相对吸附速率。利用上述方法，研究了今年基尔玉河的环境特征。测定的项目有：铜络合容量(CuCC)、pH、总有机碳、氨基酸。总之，CuCC提供了形成相对较强的铜(II)络合物的配体的信息，而相对较弱的天然配体的行为可以通过稳定性测量来分析。此外，我们还发现，产生环境的配体大致可分为两类：自然来源的配体和人类活动衍生的配体(公牛。化学，66,2104(1993)。我们的进一步研究导致了一种新的自然水中铜(II)的形态形成方法的发展，在该方法中，铜(II)-TTA的萃取被视为主要反应，而铜(II)与天然配体之间的副反应系数被确定为上述配体对铜(II)的络合程度的量度(分析科学，贡献中)。

A method of determining the lability of soluble copper(II)complex in river water was developed and published(Anal.Sci., 8,571(1992)). This method based on a phenomenon that only copper(II)ion formed via dissociation of a copper(II)complex adsorbs to the chelex column. Lability of the complex is defined as the relative rate of adsorption of copper(II)ion.By using the above method, environmental feature of the Kiryu river has been investigated thi year. Items measured other than lability are as follows : copper complexing capacity(CuCC), pH, total organic carbon, amino acids.In conclusion, CuCC was found to give information on a ligand which forms a relatively strong copper(II)-complex, while the behavior of a relatively weak natural ligand could be analyzed through lability measurement. In addition we found that environmentally occurring ligands are roughly derived into categories : ligands of natural origin and the ones derived from human activities(Bull. Chem.Soc.Jpn., 66,2104(1993)).Our further investigation leads to the development of a new method of speciation of copper(II)in natural waters in which the extraction of Cu(II)-TTA is regarded as a main reaction and a side reaction coefficient between Cu(II) and a natural ligand is determined as a measure of the degree of complexation of Cu(II) by the above ligand(Anal.Sci., in contribution).