正丙醇-氯化钠-4-(2-吡啶偶氮)-间苯二酚双水相萃取光度法测定工业废水中的Zn^(2+)  

Photometric Analysis of Zinc by Two-Phase Aqueous Extraction System of n-Propyl Alcohol-Sodium Chloride-PAR

作　　者：孙赛兰 盛小娅[1] 祖力甫哈尔.亚科甫 黎春兰[1] 何叶[1] 覃事栋[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《分析科学学报》2016年第4期545-548,共4页Journal of Analytical Science

基　　金：国家自然科学基金(No.21476095);湖南省高校科技创新团队支持计划(No.湘教通[2014]207号);吉首大学校级课题(No.15JDY005)

摘　　要：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 behavior was studied between PAR（4-（2-Pyridylazo）resorcinol） and Zn^2＋ complex in a simple aqueous two-phase system of n-Propyl alcohol/sodium chloride（NaCl）, and an aqueous two-phase extraction photometric analysis method for separating and determining Zn^2＋in industrial waste water was established. The results showed that the complex of PAR and Zn^2＋ was extracted into the n-Propyl alcohol phase at pH=8.0 of Na2B4O7-HCl buffer solution. The maximum absorption wavelength of the extracted complex in the n-Propyl alcohol phase was located at 493 nm. There was a red shift of 88 nm compared with the mixture solution of PAR and n-Propyl alcohol aqueous solution. Under this condition, Beer＇s law was obeyed for the amount of Zn^2＋ in the range of 0. 05-0.25 μg·mL^-1, and the linear correlation coefficient was 0. 9989 and the apparent molar absorptivity （ε） is 2.26 ×10^4 L·mol^-1· cm^-1. The ana measure lyti db advantages cal results obtained for Zn^2＋ in industrial waste water were in good agreement with values y atomic absorption spectrometry, and the extraction process of this method have more compared with traditional methods toward environmental safety.

关 键 词：4-(2-吡啶偶氮)-间苯二酚 双水相萃取 ZN^2+ 分光光度法 

分 类 号：O657.32[理学—分析化学]