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研究了在简单的丙醇-氯化钠双水相体系中4-(2-吡啶偶氮)-间苯二酚(PAR)与Zn2+形成的配合物的分配行为,建立了分离和测定工业废水中Zn2+的双水相萃取光度分析方法。结果表明,在pH=8.0的Na2B4O7-HCl缓冲溶液中,PAR与Zn2+形成的配合物被萃取到丙醇中,其最大吸收波长为493nm,与PAR和丙醇水溶液的混合液相比,发生了88nm的红移。在该条件下,Zn2+在0.05~0.25μg·mL-1范围内符合比尔定律,其相关系数为0.9989,表观摩尔吸光系数ε为2.26×104 L·mol-1·cm-1。该方法测定工业废水中的Zn2+与原子吸收法结果一致。
The distribution of 4- (2-pyridylazo) -resorcinol (PAR) complex with Zn2 + in a simple propanol-sodium chloride aqueous two-phase system was studied. The separation and determination of industrial wastewater Determination of Zn2 + in aqueous two - phase extraction spectrophotometry. The results showed that the complex of PAR and Zn2 + was extracted into propanol in Na2B4O7-HCl buffer solution of pH = 8.0, the maximum absorption wavelength was 493nm. Compared with the mixture of PAR and propanol aqueous solution, 88nm red shift. Under this condition, Beer’s law was obeyed in the range of 0.05-0.25 μg · mL-1 with a correlation coefficient of 0.9989 and an apparent molar absorptivity ε of 2.26 × 104 L · mol-1 · cm-1. The method for the determination of industrial wastewater Zn2 + consistent with the results of atomic absorption.