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The study of differential pulse adsorptive stripping voltammetry of co(II)/1‐nitroso‐2‐naphthol chelate
Author(s) -
Han Jilin,
Chen Hongyuan,
Gao H. Kao Hong
Publication year - 1993
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.1140050716
Subject(s) - chemistry , polarography , hanging mercury drop electrode , cobalt , inorganic chemistry , adsorptive stripping voltammetry , cathodic stripping voltammetry , chelation , dropping mercury electrode , analytical chemistry (journal) , redox , cyclic voltammetry , adsorption , voltammetry , metal ions in aqueous solution , detection limit , metal , electrochemistry , electrode , chromatography , organic chemistry
Cobalt (II)/1‐nitroso‐2‐naphthol chelate in citrate/ammonium citrate (pH 8.6) buffer solution is studied by adsorptive stripping voltammetry on a static mercury drop electrode (SMDE). The adsorbed chelate yields one distinct peak at −0.51 V, which can be utilized to quantify trace cobalt. The interfacial and redox behavior are evaluated by cyclic voltammetry and pulse polarography. The effect of accumulation potential, accumulation time, and concentration of ligand on the reduction peak currents of the chelate have been discussed. Possible interference metal ions are also investigated. The peak current is proportional to the concentration of cobalt in the range of 10 −7 to 10 −9 M (correlation coefficient 0.998). The relative standard deviation is 2.6% at the concentration of Co(II) 2.2 × 10 −8 M ( n = 7). The detection limit of Co(II) is as low as 0.05 ppb (2‐minute accumulation).