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Coulometric stripping potentiometry for arsenic( III )
Author(s) -
Ratanaohpas Roongroje,
Jagner Daniel,
Ma Feng
Publication year - 1997
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.1140090713
Subject(s) - arsenic , coulometry , chemistry , stripping (fiber) , electrolysis , hydrochloric acid , glassy carbon , inorganic chemistry , nuclear chemistry , substrate (aquarium) , analytical chemistry (journal) , selectivity , chromatography , electrochemistry , materials science , cyclic voltammetry , electrode , catalysis , organic chemistry , oceanography , composite material , electrolyte , geology
Abstract Calibration‐free determination of As III in the presence of As V using coulometric stripping potentiometry is described. As III , in the concentration range 0.01‐2 mg/L, is quantitatively reduced to elemental arsenic and simultaneously dissolved in gold codeposited onto a glassy carbon substrate by electrolysis for 4 minutes at −0.50 V (vs. Ag/AgCl (0.01 MCl − )) in 12 μL samples containing 3 M hydrochloric acid and 10 mg/L gold(III). Selectivity between arsenic(III) and (V) is achieved by proper control of the deposition potential and by minimizing the gold(III) concentration and the time between addition of gold(III) and commencement of analysis.