铟-荧光镓极谱络合吸附波的研究  

Studies on Polarographic Adsorptive Complex Wave of Indium(Ⅲ) lumogallion

作　　者：包晓玉[1] 朱志伟[1] 李南强[1] 

机构地区：[1]北京大学化学与分子工程学院,北京100871

出　　处：《北京大学学报（自然科学版）》2000年第2期149-152,共4页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金!(29835110)

摘　　要：在ｐＨ５－５ 的０－１ ｍｏｌ／Ｌ（ＣＨ２）６Ｎ４ＨＣｌ 底液中可获得铟（ Ⅲ）荧光镓体系灵敏的络合吸附波。测定铟的线性范围为１－０ ×１０ － ７ ～１－０ ×１０ － ５ ｍｏｌ／Ｌ，检测限达８ ×１０－ ８ ｍｏｌ／Ｌ，测得电活性络合物的组成为铟∶荧光镓＝ １∶２ ，条件形成常数β＝ ３－６ ×１０１３ ，表面电极反应速率常数ｋｓ１ 、ｋｓ２ 、ｋｓ３ 分别为４－４ 、１－７４ 、１０－８ｓ－ １ ，并研究了电极反应机理。In (CH\-2)\-6N\-4\|HCl buffer solution at pH 5\^5,a sensitive adsorptive complex wave of In(Ⅲ)\|lumogallion(LMG) was obtained by single\|sweep polarography.The change of peak height with the concentration of indium is linear in the range from 1\^0×10 -7 ?mol/L to 1\^0×10 -5 ?mol/L. The detection limit is down to 8×10 -8 ?mol/L. The composition of the complex was detected as In(Ⅲ)∶LMG=1∶2.The conditional stability constant was determined as β =3\^6×10 13 .The rate constant of the surface electrochemical reaction was determined as k s1 =4\^4?s -1 , k s2 =1\^74?s -1 , k s3 =10\^8?s -1 .

关 键 词：铟 荧光镓 单扫极谱法 循环伏安法 络合吸阶波 

分 类 号：O657-14[理学—分析化学]