摘要
本文基于Ｚｒ（Ⅳ）－５′－硝基－水杨基荧光酮（５′－Ｎ－ＳＡＦ）－溴化十六烷基三甲铵（ＣＴＭＡＢ）体系的荧光猝灭效应，提出一种测定微量锆的新荧光分析方法。在０．８～１．２ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中，在ＣＴＭＡＢ存在下，锆与５－Ｎ－ＳＡＦ生成组成比为１∶４的橙红色络合物。该体系存在两个激发峰，其激发波长分别为λｅｘ１＝４７５ｎｍ，λｅｘ２＝５０５ｎｍ，发射波长λｅｍ＝５２５ｎｍ。锆（Ⅳ）浓度在２．０～８０μｇ／Ｌ呈良好线性关系，检出限为２．０μｇ／Ｌ。本法灵敏度高，选择性好，用于铝合金中微量锆的测定，获得满意结果。
A new fluorometric method has been developed for the determination of trace zirconium,based on the fluorescence quenching effect of Zr(Ⅳ) 5′ nitro salicylfluorone(5′ N SAF) hexadecyltrimethylammonium bromide(CTMAB).In the H 2SO 4 medium and in the presence of CTMAB Zr(Ⅳ)reacts on 5′ N SAF to form a 14 orange complex.Its maximum excitation wavelengths are 475 and 505 nm,and the maximum emission wavelength is 525 nm.The linear range is 2 0 80 μg/L,and the detection limit is 2 0 μg/L.The method has been applied to the direct determination of trace Zr(Ⅳ) in the aluminium alloy reference sample with satisfactory results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1999年第4期578-580,共3页
Spectroscopy and Spectral Analysis
基金
宁夏区教委和区科委基金
