期刊论文

Liu, M.-Q.

中文

冶金分析

1000-7571

2006

26

1

49-51

10.3969/j.issn.1000-7571.2006.01.012

衡阳师范学院科学基金项目资助课题（2003C15）；

本校为第一且通讯机构

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(Ⅲ)的显色反应及光度性能,建立了测定镧(Ⅲ)的新方法.在pH 10.5NH3·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566.0 nm波长处,表观摩尔吸光系数为1.03×105L·mol-1·cm-1,在25 mL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 × 105 L·mol-1·cm-1. Beer's...