Characterisation of iron binding ligands in seawater by reverse titration.
Characterisation of iron binding ligands in seawater by reverse titration.
复制标题
通过反滴定表征海水中的铁结合配体。
DOI:
10.1016/j.aca.2012.12.048
复制
发表时间:
2013
影响因子:
6.2
通讯作者:
Hawkes JA
中科院分区:
文献类型:
--
作者:
Hawkes JA
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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DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
F. Millero;D. Pierrot
通讯作者:
D. Pierrot
影响因子:
5.2
作者:
Bergquist, BA;Boyle, EA
通讯作者:
Boyle, EA
影响因子:
6.2
作者:
RUZIC, I
通讯作者:
RUZIC, I
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
C. V. D. Berg
通讯作者:
C. V. D. Berg