GaⅢ-5-Br-PADAP-OP体系分光光度法测定锌渣中微量镓  

Spectrophotometric determination of trace gallium in zinc slag with GaⅢ-5-Br-PADAP-OP system

作　　者：彭翠红[1] 奚长生[1] 龙来寿[2] 曾懋华[1] 

机构地区：[1]韶关学院化学系,广东韶关512005 [2]广东工业大学轻工化工学院,广东广州510090

出　　处：《冶金分析》2004年第4期46-48,共3页Metallurgical Analysis

摘　　要：对Ga -5 Br PADAP显色体系进行了系统的研究 ,选择乳化剂OP增加显色体系的稳定性。络合物最大吸收波长λmax =5 75nm ,表观摩尔吸光系数ε=1 0 6× 10 5,2 5mL溶液中线性范围为 0～ 14 μg镓。采用甲苯 -甲基异丁酮混合溶剂萃取 ,水反萃取镓 ,消除干扰离子的影响。在水相中测定Ga ,有效地提高了方法的选择性和准确度。本法应用于测定纯铝、锌渣中微量镓 ,相对标准偏差小于 2 0 % ,回收率为 98 9%～ 99 3 %。The color system of Ga*#-5-Br-PADAP-OP was studied.The emulsion OP was selected to improve the stability of the color system.The maximum absorption of the complex formed by Ga*# with 5-Br-PADAP in the presence of OP was at 575 nm. The apparent molar absorptivity was 1.06×10~5 L·mol^(-1)·cm^(-1) and the linear range of Ga*# was 0-14 μg/25 mL.The selectivity and accuracy for the determination of Ga*# in water phase were effectually improved. Interference ions were eliminated by extracting Ga*# with mixed solvent of methyl benzene and methyl isobutyl ketone,and re-extracting Ga*# with water .The new method could be applied to the determination of trace gallium in zinc slag and pure aluminium.The relative standard deviations were less than 2.0%.The recoveries obtained were in the range of 98.9%-99.3%.

关 键 词：OP 5-BR-PADAP 甲基异丁酮 分光光度法 显色 最大吸收波长 测定 微量 混合溶剂 甲苯 

分 类 号：O657.32[理学—分析化学]