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

BAO Xiaoyu\ ZHU Zhiwei\ LI Nanqiang (College of Chemistry and Molecular Engineering,Peking University,Beijing,100871)  
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 .
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