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Highly Selective and Sensitive Determination of Silver(I) at a Poly(8‐mercaptoquinoline) Film Modified Glassy Carbon Electrode
Author(s) -
Guo Si Xuan,
Khoo Soo Beng
Publication year - 1999
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/(sici)1521-4109(199908)11:12<891::aid-elan891>3.0.co;2-9
Subject(s) - detection limit , stripping (fiber) , glassy carbon , electrode , anode , analytical chemistry (journal) , materials science , anodic stripping voltammetry , cathodic protection , working electrode , carbon fibers , chemistry , chromatography , electrochemistry , cyclic voltammetry , composite material , composite number
8‐Mercaptoquinoline was found to be electropolymerizable by a cathodic process at a glassy carbon electrode. The resulting modified electrode could be used for selective open circuit preconcentration of Ag(I). This, followed by medium exchange and anodic stripping analysis provided a highly selective and sensitive method for Ag(I) determination. Optimized procedures for both batch and flow analysis were developed. For batch determination, a detection limit of 2.7×10 –11 M Ag(I) was achieved ( S/N =3, 10 min preconcentration). The relative standard deviations ( n =11) for 1.00×10 –9 M and 2.00×10 –10 M Ag(I) were 2.60 % and 4.74 %, respectively. Similar results were observed for flow analysis. Of 44 selected potential interferents studied, only Au(III) interfered.