A novel spectrophotometric determination of copper(Ⅱ) with bromosulphonazo Ⅲ |
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作者姓名: | Li Yuan Shu Hui Huo Xiao Na Ren Hui Chen |
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作者单位: | Chemistry & Chemical Engineering College, Northwest Normal University, Lanzhou 730070, China |
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摘 要: | A novel chromogenic reaction involving copper(Ⅱ) and bromosulphonazo Ⅲ (Br-SAZⅢ) in hexamethylenetetramine- hydrochloric buffer solution was investigated. The results showed that a blue complex of copper(Ⅱ) and bromosulphonazo Ⅲ was formed with a molar ratio of 1:1. The apparent molar absorptivity was 3.3×10^5Lmol-1cm-1 and the maximum absorption peak was at 616.8 nm. The proposed procedure was used for quantitative estimation of Cu(II) in the concentration range of 0-1.024μg/mL with the detection limit (3σ) of 7.03 × 10^-4 μg/mL (n = 20). The relative standard deviations (RSDs) were 0.56-4.68%. Under the optimized conditions, total copper in the vegetables and tea was successfully determined. 2007 Li Yuan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
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关 键 词: | 蔬菜 茶叶 铜 含量测定 分光光度测定法 |
收稿时间: | 2007-07-04 |
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