控制电位氟-镓配位滴定法测定镓  

Determination of gallium with gallium-fluoride complexometry under constant potential

作　　者：张云[1] 余婷[1] 褚亮亮[1] 李通化[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《分析试验室》2007年第7期112-115,共4页Chinese Journal of Analysis Laboratory

摘　　要：以氟离子溶液作滴定剂,氟离子选择性电极作指示电极,利用氟-镓之间的配位反应及控制电位滴定法,对镓的测定进行了研究。控制溶液的pH约为4.2,实验温度为298 K,离子强度调节剂(NaNO3)的浓度为0.1 mol/L。对溶液控制的pH,氟离子的酸效应和镓离子的羟基配位效应对测定结果的影响,共存的Cu2+,Zn2+,Ni2+及Co2+等离子的干扰进行了讨论。The determination of gallium with gallium-fluoride complexometry under constant potential using fluoride ion as titrant and fluoride ion selective electrode as the indicating electrode had been studied. The pH of titration reaction was about 4.2; the temperature of experiment was 298 K; and the concentration of ionic strength adjustment buffer （NAN03） was 0.1 mol/L. The pH was controlled in the experiment, the acid effect of fluoride ion and the hydroxy effect of gallium ion which influenced the stability of gallium-fluoride complex had been discussed. The influence of Cu^2＋ , Zn^2＋ , Ni^2＋ and Co^2＋ on determination of gallium had also been discussed.

关 键 词：镓 配位滴定 电位滴定 氟离子选择性电极 

分 类 号：O657.1[理学—分析化学]