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Chemiluminescence of cobalt(II)‐catalysed auto‐oxidation of sulphite and its application to cobalt analysis
Author(s) -
Yang XiaoFeng,
Li Hua
Publication year - 2004
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.762
Subject(s) - cobalt , chemistry , chemiluminescence , reagent , detection limit , aqueous solution , inorganic chemistry , metal ions in aqueous solution , metal , ion , luminol , nuclear chemistry , chromatography , organic chemistry
The oxidation of sulphite by dissolved oxygen in aqueous solution catalysed by cobalt(II) was investigated. A weak chemiluminescence (CL) emission was observed when the reaction took place in a strong alkaline solution without any special CL reagent. Further studies showed that in the presence of uorescein sodium the CL signal was enhanced signicantly. The CL emission is linear with Co(II) concentration in the range 0.6–80 nmol/L and the detection limit is 0.3 nmol/L. In addition to Co(II), other transition metal ions were also tested, and the results showed that the proposed system was highly selective for Co(II). The method was successfully applied to the determination of Co(II) in pharmaceutical preparations. The possible CL mechanism was also discussed. Copyright © 2004 John Wiley & Sons, Ltd.