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《Chinese Journal of Analysis Laboratory》 2007-02
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Synthesis of a new reagent 8-(2-benzothiazolylazo)-5-aminoquinoline(8-BTA-5-AQ) and its color reaction with cobalt(Ⅱ)

ZHU Bin*1 and LIU Heng-chuan2(1.Department of Chemistry,Zunyi Normal College,Zunyi 563002;2.Department of Chemistry,East China Normal University,Shanghai 200062)  
In this paper,three kinds of 5-aminoquinoline-8-azo reagents have been synthesized.Their color reactions with cobalt(Ⅱ) have been studied,especially the reaction of 8-BTA-5-AQ with cobalt(Ⅱ) has been studied in detail.In a medium of pH 3.8 8-BTA-5-AQ reacts with cobalt(Ⅱ) to form a mauve complex,exhibiting maximum absorbance at 620 nm,the molar absorptivity is 5.5×104 L·mol-1·cm-1.Beer′s law is obeyed for 0~10 μg of cobalt in 25 mL of solution.The method has been successfully applied to the spectrophotometric determination of microl amounts of cobalt in the alloy steel with satisfactory results.
【Fund】: 遵义师范学院科研基金(2006010)项目资助
【CateGory Index】: O657.3
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