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研究了铅 (Ⅱ ) 7,16 二硫苯并 18 冠 6 四溴荧光素萃取光度法分析铅的新体系。 7,16 二硫苯并 18 冠 6与铅 (Ⅱ )、四溴荧光素于 pH5 8形成离子对缔合物 ,该缔合物在有机相 1,2 二氯乙烷中的最大吸收波长为 5 46nm ,摩尔吸光系数为 9 0× 10 4 l·mol-1·cm-1,测定铅的线性范围为 0～ 6 μg/5ml ,用于环境样品中铅的测定 ,结果满意
A new spectrophotometric method for the determination of lead with lead (Ⅱ) 7,16 dithiobenzoate and 18 crown-6 tetrabromofluorescein was developed. 7,16 dithiobenzoate 18 crown 6 and lead (Ⅱ), tetrabromofluorescein at pH5 8 form an ion pair associate, the association of the organic phase 1,2 dichloroethane maximum absorption wavelength of 5 46nm, molar extinction coefficient of 9 0 × 10 4 l · mol-1 · cm-1, the linear range of determination of lead 0 ~ 6 μg / 5ml, for the determination of lead in environmental samples, the results were satisfactory