用O-CIPF-CTMAB分光光度法测定铝  

Spectrophotometric Determination of Aluminium with O-C1PF and CTMAB

作　　者：罗宗铭[1] 林增文[1] Luo Zongming;Lin Zengwen

机构地区：[1]广东工学院化工系,广州

出　　处：《岩矿测试》1988年第2期104-106,共3页Rock and Mineral Analysis

摘　　要：在pH6.0的缓冲介质中,铝(Ⅲ)和邻氯苯基萤光酮及溴化十六烷基三甲基铵形成三元配合物。配合物最大吸收波长为570nm,表观摩尔吸光系数ε_(570)=1.08×10^(5)L·mol^(-1)·cm^(-1)。铝在0~11μg/25ml范围内符合比尔定律。本法用于直接测定石英岩、氧化镁及水样中的微量铝,结果满意。Aluminium(Ⅲ)and O-chlorophenylfluorone(O-C1PF)form a red complex in a buffer of K H_(2)PO_(4)-NaOH at pH 6.0,in the presence of cetyltrimethyl-ammonium bromide.The maximum absorption is at 570 nm.The ratio of Al to O-C1PF is 1:4.Its molar absorptivity is 1.08×10^(5)·L·mol^(-1)·cm^(-1)Beer’s law is obeyed from 0 to 11μg/25ml aluminium.The method has been used to the determination of trace aluminium in silexite,magnesium oxide and natural waters with satisfactory results.

关 键 词：溴化十六烷基三甲基铵 铝(Ⅲ) 三元配合物 邻氯苯基萤光酮 表观摩尔吸光系数 分光光度法测定 比尔定律 缓冲介质 

分 类 号：O65[理学—分析化学]