偶氮溴膦-PN-溴化十六烷基三甲胺分光光度法测定岩石矿物中微量镧的研究  

Investigation of Spectrophotometric Determination of Trace Lanthanum in Rocks and Minerals with Bromophosphonazo-PN and Cetyltrimethylammonium Bromide

作　　者：杨丽华[1] 吴斌才[2] Yang Li-hua;Wu Bin-cai

机构地区：[1]西安地质矿产研究所 [2]华东师大化学系

出　　处：《岩矿测试》1987年第3期183-185,I0006,共4页Rock and Mineral Analysis

摘　　要：[2-(4-溴-2-膦酸基苯偶氮)-7-(4′-硝基苯偶氮)-1,8-二羟基-3,6-萘二磺酸](简称偶氮溴膦-PN)已用于地质样品中稀土总量和铈组稀土合量的测定。A simple and rapid spectrophotometric method for the determination of trace La with bromophosphonazo-PN and cetyltrimethylammonium bromide has been investigated.In 0.1-0.6 mol/ml HNO3 medium lanthanum ions form a blue-violet complex with bromophosphonazo-PN in the presence of CTMAB and ethanol which exhibits maximum absorbance at 680 nm and its molar absorpti-vity is 1.6×10^(5)L·mol^(-1)·cm^(-1).Beer’s law is obeyed over the range 0-20μg/25 ml of La_(2)O_(3).

关 键 词：溴化十六烷基三甲胺 稀土总量 铈组稀土 岩石矿物 分光光度法测定 地质样品 萘二磺酸 PN 

分 类 号：O65[理学—分析化学]