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首页> 外文期刊>Marine Chemistry >Organic speciation of dissolved iron in estuarine and coastal waters at multiple analytical windows
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Organic speciation of dissolved iron in estuarine and coastal waters at multiple analytical windows

机译：在多个分析窗口中河口和沿海水域中溶解性铁的有机形态

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Here we use cathodic stripping voltammetry with competitive ligand exchange (CLE-CSV) to determine the speciation of Fe in samples from the Mersey River estuary and Liverpool Bay in the presence of salicylaldoxime (SA). Multiple analytical windows (MAWs) were obtained by varying the concentration of SA. Data fittings from individual titrations were compared to simultaneous analysis of all windows using KINETEQL Multiwindow Solver (KMS) giving good agreement Individual and MAW titrations agreed and demonstrated the presence of only one ligand dominating in all samples. The ligand concentration behaved non-conservatively with increasing salinity, and was in excess of the iron concentration throughout the salinity range tested. The ligand concentration co-varied with that of iron-binding humic substances (HS). Measurement of the composition of dissolved organic carbon (DOC) using 2-dimensional fluorescence scans indicated the presence of terrestrial as well as microbial sources of organic matter in the estuary. The fraction of HS in the DOC amounted between 21 and 46%. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这里，我们使用阴极溶出伏安法与竞争性配体交换（CLE-CSV）来确定在存在水杨醛肟（SA）的情况下来自默西河河口和利物浦湾的样品中铁的形态。通过改变SA的浓度获得多个分析窗口（MAW）。使用KINETEQL Multiwindow Solver（KMS）将来自各个滴定的数据拟合与同时分析所有窗口进行了比较，得出了很好的一致性。个体滴定和MAW滴定一致，并证明在所有样品中仅存在一种配体。配体浓度随盐度的增加呈非保守性表现，并且在整个测试的盐度范围内均超过铁浓度。配体浓度与铁结合腐殖质（HS）的浓度共变。使用二维荧光扫描法测量溶解有机碳（DOC）的组成表明，河口中存在陆基和微生物源有机物。 DOC中的HS含量介于21％和46％之间。 （C）2015 Elsevier B.V.保留所有权利。

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