速差动力学分光光度法同时测定镍和锌  

Study on simultaneous determination of nickel(Ⅱ) and zinc(Ⅱ)by differential reaction-rate kinetic spectrophotometry

作　　者：叶明德[1] 陈忠秋 

机构地区：[1]温州师范学院化学系,温州325027

出　　处：《分析试验室》2003年第1期72-74,共3页Chinese Journal of Analysis Laboratory

摘　　要：研究了镍与 5 Br PAN S显色反应的动力学特性。在pH 6.0条件下 ,当[5 Br PAN S]:[Ni2 + ]≥ 2 1 .6时 ,该反应在常温下数分钟内即能完成 ,并测得其表观摩尔吸光系数为 5 .0 0× 1 0 4 L·mol-1·cm-1,求得表观活化能为 44 34kJ mol。利用 5 Br PAN S与镍反应速率较慢 ,建立了一种准确测定混合体系中镍和锌含量的速差动力学分光光度法。方法已应用于电镀废液中镍和锌的同时测定。The kinetic characteristics of color reaction of nickel(Ⅱ) with 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulphonic acid (5-Br-PAN-S) was studied. When the concentration of 5-Br-PAN-S was over 21.6 times than that of nickel(Ⅱ), the reaction was completed in a few minutes at room temperature condition. The apparent activation energy of this reaction was 44.34 kJ/mol. The reaction of Ni(Ⅱ) with 5-Br-PAN-S was slower than that of Zn(Ⅱ). Based on this, a differential kinetic spectrophotometry was developed for the simultaneous determination of nickel (Ⅱ) and zinc(Ⅱ). The method was applied to the simultaneous determination of nickel (Ⅱ) and zinc(Ⅱ) in electroplating waste water samples with satisfactory results.

关 键 词：速差动力学分光光度法 同时测定 镍 锌 

分 类 号：O657.31[理学—分析化学]