科研之友
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摘要
A simple, sensitive, and highly selective method is proposed for the determination of zinc(II) using a bis-azo dye, 2,6-bis(1-hydroxy-2-naphthylazo)pyridine as spectrophotometric reagent. At pH7.8, in 50% (v/v) ethanol-water medium, the complex is found to obey Beer's law up to 1.3 mg/L with an optimum concentration range between 0.19 and 1.0 mg/L. Sandell's sensitivity of the color reaction was calculated to be 0.0011 mu g cm(-2) with molar absorptivity of 6.0 x 10(4) L mol(-1) cm(-1) at 560 nm. The optimum conditions for the determination of Zn(II) with the reagent were ascertained. The complexation at different pH was studied in water-ethanol medium. The composition of the complex is 1:2. The action of some interfering ions was verified, and the developed method applied successfully for the estimation of zinc levels in food and milk samples, and the results were then compared with those obtained by using AAS.
- 出版日期2009-12
