镧Ⅲ-9-(3,5-二溴)水杨基荧光酮-溴化十六烷基三甲铵三元络合物显色反应的研究与应用  

Study on the color reaction of ternary complex of lanthanumⅢ-9-3,5-dibromosalicyl fluorone-cetyltrimethyl ammonium bromide and its application

作　　者：刘梦琴[1] 冯泳兰[1] 莫运春[1] 谢红旗[1] 曾荣英[1] 

机构地区：[1]衡阳师范学院化学与材料科学系,湖南衡阳421008

出　　处：《冶金分析》2006年第1期49-51,共3页Metallurgical Analysis

基　　金：衡阳师范学院科学基金项目资助课题(2003C15)

摘　　要：研究了在阳离子表面活性剂溴化十六烷基三甲铵（CTMAB）存在下，9-（3，5-二溴）水杨基荧光酮（DBSAF）与镧㈣的显色反应及光度性能，建立了测定镧（Ⅲ）的新方法。在pH10．5NH3·H2O-NH4Cl缓冲溶液中，La（Ⅲ）与DBSAF及CTMAB形成摩尔比为1：2：4的紫红色三元络合物，其最大吸收峰位于566．0nm波长处，表观摩尔吸光系数为1．03×10^5L·mol^-1·cm^-1，在25mL溶液中镧（Ⅲ）量在0～24μg范围内符合比尔定律。该法已用于电子工业钛酸镧烧结中游离氧化镧的测定。In the presence of surfactant cetyltrimethyl ammonium bromide（CTMAB）, the photometric properties of color reaction of 9-3,5-dibromosalicyl fluorone（DBSAF）with La（Ⅲ） were studied, and a new method was found for the determination of La（Ⅲ）. The experimental results showed that La（Ⅲ） reacted with DBSAF and CTMAB to form a micelle complex with a maximum absorption at 566.0 nm in a pH 10.5 NH3·H2O - NH4Cl buffer solution. The apparent molar absorptivity of the complex,with a stoichiometric ratio of 1：2：4 is 1.03 × 10^5 L·mol^-1·cm^-1 .Beer＇s law was obeyed in the range of 0～24 μg/25 mL for La（Ⅲ）. The proposed method has been applied to the determination of trace La2O3 in the lanthanum titanate sinter with satisfactory results.

关 键 词：镧(Ⅲ) 9-(3 5-二溴)水杨基荧光酮 分光光度法 溴化十六烷基三甲铵 

分 类 号：O657.3[理学—分析化学]