Distribution and speciation of copper and its relationship with FDOM in the East China Sea
Distribution and speciation of copper and its relationship with FDOM in the East China Sea
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DOI：
10.1016/j.marchem.2019.04.005
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发表时间：
2019-05
期刊：
影响因子：
3
通讯作者：
K. H. Wong;H. Obata;Taejin Kim;Yohei Wakuta;S. Takeda
中科院分区：
文献类型：
--
作者：
K. H. Wong;H. Obata;Taejin Kim;Yohei Wakuta;S. Takeda
测定了东海海域海水中溶解Cu的总浓度、Cu结合有机配体的浓度和条件稳定常数以及荧光溶解有机质（FDOM）组分的强度。用5 μM SA检测窗口的CLE-AdCSV检测有机配体的浓度。总溶解铜浓度在0.59 nM ~ 4.65 nM之间，受长江稀释水的影响，低盐度地表水的总溶解铜浓度特别高。强配体（L1）的浓度在0.65 ~ 6.92 nM之间，其分布与Cu的分布密切相关。在地表水中检测到4种FDOM成分，包括2种腐殖质样成分和2种蛋白质样成分。l浓度与4种FDOM成分的浓度分布规律相似。弱配体（L2）的浓度范围为2.86 nM ~ 31 nM，在未受黑潮影响的台站地表水中检测到的浓度最高。研究发现，东海铜结合有机配体的缓冲能力足以响应大气和人为Cu输入，并保持游离铜离子浓度相对恒定。
Total dissolved Cu concentrations, concentrations and conditional stability constants of Cu-binding organic ligands, and the intensities of fluorescent dissolved organic matter (FDOM) components in seawater were determined in the East China Sea. Concentrations of organic ligands were determined using CLE-AdCSV with a 5 μM SA detection window. Total dissolved Cu concentrations ranged from 0.59 nM to 4.65 nM and were particularly high in surface waters with low salinity due to influences of the Changjiang Diluted Water. Concentrations of the stronger ligand (L1) were between 0.65 and 6.92 nM and its distribution closely followed that of dissolved Cu. Four FDOM components were detected in surface waters, including two humic-like and two protein-like components. L1concentrations exhibited similar distribution patterns to the intensities of all four FDOM components. The concentrations of the weaker ligands (L2) ranged from 2.86 nM to 31 nM, with the highest concentrations detected in the surface waters of stations unaffected by the Kuroshio Current. We found the buffering ability of Cu-binding organic ligands in the East China Sea to be sufficient for responding to atmospheric and anthropogenic Cu inputs and keeping the free cupric ion concentrations relatively constant.