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Flow Injection Analysis of Ultratrace Sulfide at Low Potentials on Screen‐Printed Carbon Electrode Modified with Cinder/Hexacyano Cobaltate Hybrid
Author(s) -
Zen JyhMyng,
Chen PeiYan,
Kumar Annamalai Senthil
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200204)14:7/8<513::aid-elan513>3.0.co;2-3
Subject(s) - cinder , bimetallic strip , sulfide , flow injection analysis , chemistry , electrochemistry , electrode , carbon fibers , detection limit , inorganic chemistry , nuclear chemistry , analytical chemistry (journal) , materials science , catalysis , organic chemistry , chromatography , composite number , composite material , coal
Flow injection analysis (FIA) of ultratrace sulfide has been demonstrated on a screen‐printed carbon electrode modified with industrially waste cinder/hexacyano cobaltate (CoHc) hybrid (designated as cinder/CoHcSPE) in pH 2 NH 4 Cl (0.1 M)/HCl solution at 0 mV (vs. Ag/AgCl). Hybridization of CoHc was achieved through bimetallic formation of Fe III [Co III (CN) 6 ] in the *Fe III [Co III (CN) 6 ] in the *Fe‐enriched industrially waster cinder modifier. Possible mediated electrocatalytic oxidation of sulfide by higher oxidation state of Co in the hybrid‐bimetallic complex is proposed for the system. Under the optimized conditions, the calibration plot is linear up to 2.08 μM with slope, regression coefficient, and detection limit ( S / N =3) of 6.19 A/μM, 0.9985, and 12 nM, respectively. Interferences by direct electrochemical oxidation of easily oxidizable substances can be prevented due to the low detecting potential of the working system.