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A Combination Bismuth Bulk Electrode and Its Use in Adsorptive Constant‐Current Stripping Chronopotentiometry for Iron Using Solochrome Violet RS
Author(s) -
Pimrote Wachirawan,
RatanaOhpas Roongroje,
Renman Lars
Publication year - 2011
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.201100013
Subject(s) - bismuth , electrode , chemistry , analytical chemistry (journal) , stripping (fiber) , detection limit , reproducibility , materials science , nuclear chemistry , chromatography , composite material , organic chemistry
A new combination bismuth bulk electrode allowing potentiostatic control to be maintained in a suspended sample drop is described. The electrode was tested by adsorptive constant‐current stripping chronopotentiometry for iron(III) using Solochrome Violet RS. Optimum conditions were similar to those established with mercury‐based electrodes. With an electropolishing scheme, a reproducibility better than 2 % ( n =54) was attainable. The limit of detection was 0.6 µg L −1 in deoxygenated samples. A partial least squares calibration gave a result of 972±78 µg L −1 (95 %, n =5) for a 1000±5 µg L −1 iron reference solution.