异丙醇-硫酸铵-PAN双水相萃取光度法测定镍(Ⅱ)  

Determination of Nickel(Ⅱ)in Isopropyl Alcohol-Ammonium Sulfate-PAN Aqueous Two-Phase Extraction System by Spectrophotometry

作　　者：张树贵[1] 孙赛兰 董红敏[1] 王鹏鹏[1] 李佑稷[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：《吉首大学学报（自然科学版）》2015年第1期57-60,共4页Journal of Jishou University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(51172092)

摘　　要：研究了异丙醇水溶液与（NH4）2SO4的双水相体系下,螯合剂PAN（1-（2-吡啶偶氮）-2-萘酚）与Ni 2＋以及吐温80形成的缔合物在两相间的分配行为.结果表明,该缔合物的最大吸收波长为562nm,与PAN和异丙醇水溶液的混合液相比,最大吸收发生了97nm红移.应用该缔合物体系分离测定镍时,其线性范围为0.10~0.60mg/L,线性相关系数为0.999 2,表观摩尔吸光系数为1.7×105 L·mol-1·cm-1.利用该方法萃取测定Ni（Ⅱ）时,干扰离子铅（Ⅱ）、锌（Ⅱ）、铝（Ⅲ）、锰（Ⅱ）、钼（Ⅶ）、Fe（Ⅲ）、铬（Ⅶ）不被萃取,实现Ni（Ⅱ）与上述干扰离子的分离.The distribution behavior of the association complex formed by the chelating agent PAN（ 1-（2- pyridineazo）-2-naphthol） with Ni2＋ and Tween 80 was studied in the aqueous two-phase system between isopropyl alcohol and （NH4）2 SO4 solution. The results showed that the maximum absorption wavelength of associated complex was located at 562 nm which turned to the red shift of 97 nm compared with the mixture of PAN and alcohol solution. The linear range of the calibration curve was 0.10~0.60 mg/L, with the linear correlation coefficient being 0. 999 2 and the apparent molar absorbance e being 1.7X l0S L · tool 1 · cm-1. The interfering ions, such as lead（ Ⅱ ）, zinc （ Ⅱ ）, aluminum （Ⅲ ）, manganese （Ⅱ ）, mo- lybdenum（ Ⅵ ）, iron（ Ⅲ ）, chromium （ VI ）, and Ni（ Ⅱ ）, were not extracted by the system, and the Ni （ Ⅱ ） was separated from the interfering ions mentioned above.

关 键 词：双水相萃取 分离 镍 1-(2-吡啶偶氮)-2-萘酚 吐温80 

分 类 号：O658.2[理学—分析化学]