流动注射离子交换分离-火焰原子吸收光谱法连续测定铁的形态  

STUDY ON SPECIATION ANALYSIS OF IRON BY FLOW INJECTION-ION EXCHANGE SEPARATION HYPHENATED WITH FAAS

作　　者：郑洪涛[1] 汤志勇[1] 李威[1] 王迪民[2] 

机构地区：[1]中国地质大学材料科学与化学工程学院,武汉430074 [2]宜昌地质矿产研究所,宜昌443003

出　　处：《理化检验（化学分册）》2006年第9期759-761,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：研究了一种以NH4F为掩蔽剂掩蔽Fe(Ⅲ),用732型阳离子交换树脂(CSR)吸附Fe(Ⅱ),从而分离测定Fe(Ⅲ)与Fe(Ⅱ)的试验体系。设计了一套新颖的用于该体系的全自动流动注射流路,实现了Fe(Ⅲ)与Fe(Ⅱ)的连续测定。Fe(Ⅲ)和Fe(Ⅱ)的相对标准偏差(n=7)分别为3.37%和1.95%,检出限分别为0.07和0.01 mg.L-1,分析速度为25个样/h。A method of flow injection ion exchange separation followed by flame atomic absorption spectrometry for the speciation analysis of iron was studied in this paper. Iron（ Ⅲ ） in sample solution was masked by addition of NH4 F and Fe（ Ⅱ ） was adsorbed on the micro column packed with 732^# cation exchange resin. The adsorbed Fe（ Ⅱ ） was then eluted with 6 mol . L^-1 HC1 solution. Fe（ Ⅲ） and Fe（ Ⅱ ） were successively determined by flame atomic absorption spectrometry. Detection limits of this method were found as 0.07 mg . L ^-1 for Fe（ Ⅲ ） and 0.01 mg. L^-1 for Fe（ Ⅱ ）, and RSD＇s （n= 7） of 3. 37% for Fe（ Ⅲ ） and 1. 95% for Fe（ Ⅱ ）. Using the proposed method, about 5 samples can be analyzed in an hour.

关 键 词：流动注射 离子交换 火焰原子吸收光谱法 铁 形态分析 

分 类 号：O657.31[理学—分析化学]