Qiao Yong
2010
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Journal
Chinese Journal of Spectroscopy Laboratory
Abstract
The color reaction of 3,5-bis(1-carboxy-4,5-dimethoxy-2-benzeaminoazo)benzoic acid (CDMOBAABA) with copper(Ⅱ) was studied.In the presence of Triton X-100,the reagent reacts with copper (Ⅱ) to form a red complex in pH 9.5 NH3-NH4Cl buffer solution.The maximum absorption of the reagent and the complex are at 470nm and 540nm,respectively.The molar absorption coefficient is 2.43×105L·mol-1·cm-1 for the complex.Beer's law was obeyed in the range of 0—20μg/25mL for copper(Ⅱ).This method has been applied to the determination of copper in aluminum alloy samples with RSD of 1.89%.The results of the method are in agreement with those of AAS.