Citation: Li Yuan, Shu Hui Huo, Xiao Na Ren, Hui Chen. A novel spectrophotometric determination of copper(Ⅱ) with bromosulphonazo Ⅲ[J]. Chinese Chemical Letters, ;2008, 19(1): 92-94. doi: 10.1016/j.cclet.2007.10.038 shu

A novel spectrophotometric determination of copper(Ⅱ) with bromosulphonazo Ⅲ

Chemistry & Chemical Engineering College, Northwest Normal University, Lanzhou 730070, China

Received Date: 4 July 2007

A novel ehromogenic 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 3.3×10⁵Lmol^-1cm^-1 and the maximum absorption peak was at 616.8 nm. The proposed procedure was used for quantitative estimation of Cu(Ⅱ) inthe concentration range of 0-1.024 μg/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.
- Spectrophotometry,
- Bromosulphouazo Ⅲ,
- Copper(Ⅱ),
- Vegetable,
- Tea
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