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首页> 外文期刊>Estuarine Coastal and Shelf Science >Assessment of colloidal copper speciation in the Mekong River Delta using diffusive gradients in thin film techniques
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Assessment of colloidal copper speciation in the Mekong River Delta using diffusive gradients in thin film techniques

机译：利用薄膜技术中的扩散梯度评估湄公河三角洲的胶体铜形态

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Colloidal Cu speciation along the salinity gradient in the Mekong River Delta was investigated using diffusive gradients in thin films (DGT) probes equipped with diffusive layers that had nominal pore sizes of 390 nm (DGT(390)) and 45 nm (DGT(45)). An open pore gel made of 1.5% agarose was used for the 390 nm pore size cutoff, and a restricted gel made of 40% acrylamide monomer was used for the 45 nm cutoff. When DGT390 and DGT45 were deployed in a 0.01 M NaNO3 solution for up to four days, the mean ratio of Cu accumulated in DGT390 to dissolved Cu (dCu) (<0.45 gm) was 1.0, and Cu accumulated in DGT45 to dCu was 0.98. By contrast, when DGT390 and DGT45 probes were deployed in Mekong River water of salinity 0, the ratio increased with increasing deployment time, from 0.15 to 1.0 for DGT390 and from 0.02 to 0.52 for DGT45, for four days. This demonstrates that the slow dissociation of colloidal Cu complex confines the rapid accumulation of colloidal Cu in DGT45, implying the potential of DGT probes for colloidal Cu monitoring. The same DGT probes were deployed in the Mekong River in order to test its in situ applicability. The colloidal fraction, determined by the difference between dCu and Cu accumulated in DGT45, ranged from 67% to 77% of dCu at the low-salinity sites but from 8.7% to 9.1% of dCu at the brackish sites. A large amount of particle suspension typically found at the salinity front of the Mekong River seemed to play a critical role in the transport of Cu by providing dCu and organic colloids from suspended sediment. Based on our test results, employing DGT probes is likely a promising method for monitoring colloidal Cu in natural water. (C) 2017 Elsevier Ltd. All rights reserved.
机译：使用配备有标称孔径分别为390 nm（DGT（390））和45 nm（DGT（45）的扩散层的薄膜（DGT）探针中的扩散梯度，研究了湄公河三角洲沿盐度梯度的胶体Cu形态。 ）。 390 nm的孔径截止值使用1.5％琼脂糖制成的开孔凝胶，而45 nm的截止值采用40％丙烯酰胺单体制成的受限凝胶。当将DGT390和DGT45部署在0.01 M NaNO3溶液中长达4天时，DGT390中积累的Cu与溶解的Cu（dCu）（<0.45 gm）的平均比率为1.0，DGT45中对dCu积累的Cu为0.98。相反，将DGT390和DGT45探针部署在盐度为0的湄公河水中时，该比例随部署时间的增加而增加，从DGT390的0.15到1.0，以及DGT45的0.02到0.52，持续4天。这表明胶体铜络合物的缓慢解离限制了胶体铜在DGT45中的快速积累，这意味着DGT探针具有监测胶体Cu的潜力。为了测试其原位适用性，在湄公河中部署了相同的DGT探测器。由DGT45中dCu和累积的Cu之间的差异确定的胶体分数在低盐度部位为dCu的67％至77％，而在微咸部位为dCu的8.7％至9.1％。通常在湄公河盐度前沿发现的大量颗粒悬浮液似乎通过从悬浮沉积物中提供dCu和有机胶体而在Cu的运输中起关键作用。根据我们的测试结果，采用DGT探针可能是监测天然水中胶体铜的一种有前途的方法。 （C）2017 Elsevier Ltd.保留所有权利。

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