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A new highly sensitive color reaction of selenium(Ⅳ) with potassium iodide and malachite green and arabic gum has been studied.The optimum conditions and the main characters of the system have been determined.The apparent molar absorptivity of the complex is 2.5×10 5L·mol -1 ·cm -1 at 660nm.Beers law is applicable over a range of 0 25μg/25ml for Se(Ⅳ).The method has been amployed for the determination of selenium(Ⅳ) in Chinese herbal medicines,Lingzhi and Huangqi,the results being satisfactory.
A new highly sensitive color reaction of selenium (Ⅳ) with potassium iodide and malachite green and arabic gum has been studied. The optimum conditions and the main characters of the system have been determined. The apparent molar absorptivity of the complex is 2.5 × 10 5 L · Mol -1 · cm -1 at 660nm.Beers law is applicable over a range of 0 25μg / 25ml for Se (Ⅳ) .The method has been amployed for the determination of selenium (Ⅳ) in Chinese herbal medicines, Lingzhi and Huangqi , the results being satisfactory.