Characterisation of iron binding ligands in seawater by reverse titration.

Characterisation of iron binding ligands in seawater by reverse titration.
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通过反滴定表征海水中的铁结合配体。

DOI:
10.1016/j.aca.2012.12.048
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发表时间:
2013
影响因子:
6.2
通讯作者:
Hawkes JA
Hawkes JA
中科院分区:
化学1区
文献类型:
--
作者:
Hawkes JA

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在这里,我们展示了使用反滴定-竞争配体交换吸附阴极溶出伏安法(RT-CLE-ACSV)分析海水中的铁(Fe)结合配体。与检测溶液中过量配体的正向滴定法不同,rt - cel - acsv通过增加添加(电活性)配体(1-亚硝基-2-萘酚)的浓度和分析添加配体结合铁的比例来检测现有的铁配体配合物。数据操作可以准确表征海水中铁浓度相等或更低的配体,并且不考虑电化学惰性溶解铁,如一些胶体相。因此,该方法优于在高铁和低配体浓度或高浓度惰性铁环境下的正向滴定。我们使用铁载体配体铁胺B验证了该技术,并观察到稳定常数0.74-4.37×1021mol−1,与先前的结果一致。我们还成功地分析了沿海水域和深海热液柱的样本。来自这些环境的样品无法使用正向滴定法进行可靠的分析,这突出了RT-CLE-ACSV技术在含有高浓度惰性铁的水中的有效性。
Here we demonstrate the use of reverse titration - competitive ligand exchange–adsorptive cathodic stripping voltammetry (RT-CLE–ACSV) for the analysis of iron (Fe) binding ligands in seawater. In contrast to the forward titration, which examines excess ligands in solution, RT-CLE–ACSV examines the existing Fe-ligand complexes by increasing the concentration of added (electroactive) ligand (1-nitroso-2-naphthol) and analysis of the proportion of Fe bound to the added ligand. The data manipulation allows the accurate characterisation of ligands at equal or lower concentrations than Fe in seawater, and disregards electrochemically inert dissolved Fe such as some colloidal phases. The method is thus superior to the forward titration in environments with high Fe and low ligand concentrations or high concentrations of inert Fe. We validated the technique using the siderophore ligand ferrioxamine B, and observed a stability constant [Formula: see text] of 0.74–4.37×1021mol−1, in agreement with previous results. We also successfully analysed samples from coastal waters and a deep ocean hydrothermal plume. Samples from these environments could not be analysed with confidence using the forward titration, highlighting the effectiveness of the RT-CLE–ACSV technique in waters with high concentrations of inert Fe.
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