Organic complexation of copper in estuarine waters: An assessment of the multi-detection window approach
Organic complexation of copper in estuarine waters: An assessment of the multi-detection window approach
复制标题
河口水域中铜的有机络合：多检测窗口方法的评估
DOI：
10.1016/j.marchem.2018.07.001
复制
发表时间：
2018
期刊：
影响因子：
3
通讯作者：
and H. Ogawa
中科院分区：
文献类型：
--
作者：
Wong;K. H.;H. Obata;T. Kim;A. S. Mashio;H. Fukuda;and H. Ogawa
海水中溶解态Cu的形态主要以有机络合为主。然而，由于存在许多不同种类的天然存在的有机配体，分析变得复杂。在这项研究中，我们成功地确定了总溶解铜浓度，铜络合配体浓度和条件稳定常数在日本河口沃茨，采用竞争性配体交换吸附溶出伏安法（CLE-AdCSV）耦合多检测窗口的方法。采用ProMCC软件计算了Cu的形态参数。使用5 μM SA检测窗口足以有效检测大槌湾沃茨中的两种配体。强配体（L1）的浓度在1.95和4.21 nM之间，而弱配体（L2）的浓度在6.3-33 nM的范围内。强配体的条件稳定常数约为1015，而弱配体的条件稳定常数平均约为1013。在所有的样品中，L1浓度超过总溶解铜浓度，这两个参数是强相关性。游离Cu 2+浓度在10− 13和10− 15 M之间，这个范围对大多数浮游植物没有毒性。
Speciation of dissolved Cu in seawater is mainly dominated by organic complexation. However, the analysis is complicated by the presence of many different classes of naturally-occurring organic ligands. In this study, we successfully determined the total dissolved Cu concentrations, Cu-complexing ligand concentrations and their conditional stability constants in Japanese estuarine waters using competitive ligand exchange adsorptive stripping voltammetry (CLE-AdCSV) coupled with a multi detection window approach. The Cu speciation parameters were calculated using ProMCC software. The use of the 5 μM SA detection window was sufficient and effective in detecting two ligand classes in the waters of Otsuchi Bay. The concentrations of the strong ligands (L1) were between 1.95 and 4.21 nM, while the concentrations of the weak ligand (L2) were in the range of 6.3–33 nM. The conditional stability constants of the strong ligand were around 1015, while those of the weak ligands averaged around 1013. In all of the samples, the L1concentrations exceeded the total dissolved Cu concentrations, and the two parameters were strongly correlated. Free Cu2+concentrations were between 10−13and 10−15M, a range that is not toxic for most phytoplankton.