纯铝中痕量镓的测定及机理研究  

Determination of Trace Gallium in Pure Aluminium Samples and Reaction Mechanism

作　　者：李风菊[1] 刘灵芳[2] 亓小曼 冶保献[2] 

机构地区：[1]郑州教育学院,郑州450052 [2]郑州大学化学系,郑州450052

出　　处：《郑州大学学报（理学版）》2002年第3期81-85,共5页Journal of Zhengzhou University:Natural Science Edition

基　　金：河南省科委自然科学基金资助课题 (0 2 110 2 0 40 0 )

摘　　要：研究了纯铝中痕量镓示波极谱的直接测定方法 .在醋酸缓冲溶液中 ,溴邻苯三酚红 (BPR)与镓形成具有电活性的红色络合物 ,该络合物在滴汞电极上于 -1 .1 5 V产生一灵敏的极谱还原波 ,峰电流与镓浓度在 2 .0× 1 0 - 7mol/ L～ 1 .0× 1 0 - 5mol/ L范围内呈良好线性关系 ,检测限达 1× 1 0 - 7mol/ L.该方法应用于纯铝中痕量镓的直接测定 ,简便快速 ,灵敏度高 ,结果准确 .此外 ,还研究了电极反应的动力学参数 .A new method for direct determination of trace gallium in pure aluminium samples by oscillopolarography is reported. In 0.1 mol/L acetate buffer solution (pH5.0), the gallium and bromopyrogallol red form a red complex. The complex gives a sensitive reduction peak at mercury electrode with peak potential of \{-1.15V\}. The peak currents are linear with gallium concentrations in the range of 2.0×10 -7 mol/L～1.0×10 -5 mol/L by detected limit of 1.0×10 -7 mol/L. This method is used to detect the trace gallium in pure aluminium samples with satisfactory results. Moreover, the kinetics parameters of electrode reaction are investigated by multi electrochemical techniques.

关 键 词：纯铝 痕量镓 溴邻苯三酚红 示波极谱法 含量测定 电极反应 电化学分析 测定机理 

分 类 号：O614.371[理学—无机化学] O657.14[理学—化学]