壳聚糖分离富集分光光度法测定微量镍  

Spectrophotometric determination of trace amounts of Ni (Ⅱ) in water after its preconcentration on chitosan

作　　者：刘运学[1] 范兆荣[2] 谷亚新[2] 邓桂春[3] 夏心泉[1] 

机构地区：[1]沈阳化工学院环境工程系,辽宁沈阳110142 [2]沈阳建筑大学材料学院,辽宁沈阳110168 [3]辽宁大学化学系,辽宁沈阳110021

出　　处：《化学试剂》2005年第1期24-26,共3页Chemical Reagents

摘　　要：研究了壳聚糖对Ni(Ⅱ)的富集、洗脱性能及苯并噻唑重氮氨基偶氮苯BTDAB与Ni(Ⅱ)的显色反应,建立了微量镍的分离富集光度测定新方法。实验表明,壳聚糖对Ni(Ⅱ)吸附性能良好,其吸附的最佳pH为8.0,吸附在4h内已基本达到平衡;在非离子表面活性剂Triton X-100的存在下,BTDAB与Ni(Ⅱ)形成3:1的橙红色配合物,最大吸收波长位于550nm处,表观摩尔吸光系数为1.64×105L·mol-1·cm-1,镍含量在0-10μg/25mL范围内符合比尔定律。方法直接应用于废水中微量镍的测定,结果令人满意。The adsorption and elution properties of chitosan(CTS) for Ni(Ⅱ) ion and the chromogenic reaction of a new reagent benzothiazolyldiazoaminoazobenzene(BTDAB) were investigated, and a new spectrophotometric method was established to determine trace amounts of nickel(Ⅱ) in waster water. The experimental results showed that the adsorpdon properties of CIS for Ni (Ⅱ) ion was very good. It showed good adsorption at pH value 8.0 and equilibrium was attained within 4h; in the presence of Triton X-100, BTDAB formed with nickel(Ⅱ) an orange-red complex of component ratio 3:1. The absorption maximum of the complex was at 550nm with an apparent molar absorptivity of 1.64×105L·mol-1·cm-1. Beer's law was obeyed for nickel (Ⅱ) in the range of 0-10uuuuuug/25mL.This method was employed to determine trace amounts of nickel(Ⅱ) in waster water with satisfactory results.

关 键 词：壳聚糖 分光光度法 镍(Ⅱ) 分离 富集 

分 类 号：O636.1[理学—高分子化学] TQ028.1[理学—化学]