Study on the solid phase extraction and spectrophotometric determination of cobalt with 5-(2-benzothiazolylazo)-8-hydroxyquinolene

被引:28
作者
Amin, Alaa S. [1 ]
机构
[1] Benha Univ, Fac Sci, Dept Chem, Banha, Egypt
关键词
Solid phase extraction; Spectrophotometry; Thiazolylazo dyes; Cobalt determination; CHROMOGENIC REAGENT; PRECONCENTRATION; COPRECIPITATION; ENRICHMENT;
D O I
10.1016/j.arabjc.2010.12.008
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A highly sensitive, selective and rapid method for the determination of cobalt based on the rapid reaction of cobalt(II) with 5-(2-benzothiazolylazo)-8-hydroxyquinolene BTAHQ and the solid phase extraction of the Co(II)-BTAHQ complex with C18 membrane disks were developed. In the presence of pH = 6.4 buffer solution and cetylpyridenium chloride (CPC) medium, BTAHQ reacts with cobalt to form a deep violet complex with a molar ratio of 1: 1 (cobalt to BTAHQ). This complex was enriched by the solid phase extraction with C18 membrane disks. An enrichment factor of 100 was obtained by elution of the complex from the disks with a minimal amount of isopentyl alcohol. In isopentyl alcohol medium, the molar absorptivity of the complex is 2.42 x 10(5) L mol(-1) cm(-1) at 658 nm. Beer's law is obeyed in the range of 0.01-0.38 mu g mL(-1) in the measured solution. The relative standard deviation for 11 replicate samples of 0.20 mu g mL(-1) level is 1.37%. The detection and quantification limits reach 3.1 and 9.7 ng mL(-1) in the original samples. This method was applied for the determination of cobalt in biological, water, soil and pharmaceutical preparation samples with good results. (C) 2011 Production and hosting by Elsevier B. V. on behalf of King Saud University.
引用
收藏
页码:715 / 721
页数:7
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