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The determination of iron in seawater using catalytic cathodic stripping voltammetry
Author(s) -
Yokoi Kunihiko,
van den Berg Constant M. G.
Publication year - 1992
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140040113
Subject(s) - cathodic stripping voltammetry , hydrogen peroxide , chemistry , seawater , detection limit , catalysis , adsorption , inorganic chemistry , sodium dodecyl sulfate , stripping (fiber) , voltammetry , reagent , pulmonary surfactant , nuclear chemistry , chromatography , electrochemistry , materials science , organic chemistry , oceanography , electrode , composite material , geology , biochemistry
The sensitivity of the determination of iron in natural waters, including seawater, using cathodic stripping voltammetry (CSV) with adsorptive collection of complexes with 1‐nitroso‐2‐naphthol is greatly enhanced by catalytic reoxidation in the presence of hydrogen peroxide. The limit of detection is lowered to 0.16 nM Fe (using an adsorption time of 60 s) and further to 0.03 nM Fe by increasing the adsorption time to 10 min. Interference from an increase in the background current, brought about by catalysis of the hydrogen evolution, is overcome by addition of an anionic surfactant (sodium dodecyl sulfate (SDS)). Optimal conditions include a hydrogen peroxide concentration of 1.8 mM and 5 ppm SDS. Procedures to purify the reagents from contaminant levels of iron are described. The method is successfully applied to certified seawater and samples from the North Atlantic.