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食品添加剂中砷和铅的微波消解-氢化物发生原子荧光法测定
引用本文:张锂,韩国才.食品添加剂中砷和铅的微波消解-氢化物发生原子荧光法测定[J].食品与发酵工业,2005,31(12):106-109.
作者姓名:张锂  韩国才
作者单位:1. 兰州工业高等专科学校基础学科部,兰州,730050;西北师范大学化学化工学院,兰州,730070
2. 兰州工业高等专科学校基础学科部,兰州,730050
摘    要:采用微波消解方法,一次性分解样品,氢化物发生-原子荧光法,分别在硫脲、L-半胱氨酸和草酸、铁氰化钾存在下,实现了食品添加剂中砷、铅的测定,并对各种分析条件进行了优化和探讨。测定砷、铅回收率分别为97.0%~103.0%、98.7%~105.6%。检出限分别为0.35μg/L和0.12μg/L,用该方法测定食品添加剂中的砷、铅,结果满意。

关 键 词:微波消解  氢化物发生原子荧光法  食品添加剂    
收稿时间:08 24 2005 12:00AM
修稿时间:11 9 2005 12:00AM

Determination Arsenic and Lead in Food Addition by Using Microwave Digestion Hydride Generation-atomic Fluorescence Spectrometry
Zhang Li,Han Guocai.Determination Arsenic and Lead in Food Addition by Using Microwave Digestion Hydride Generation-atomic Fluorescence Spectrometry[J].Food and Fermentation Industries,2005,31(12):106-109.
Authors:Zhang Li  Han Guocai
Affiliation:1,Basic Course Apartment, Lanzhou Polytechnic College, Lanzhou 730050, China;2,College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070,China
Abstract:A method of determining arsenic and lead in food addition by Microwave Digestion Hydride Generation-Atomic Fluorescence Spectrometry was established.The sample was digested with nitric acid and hydrogen peroxide,using a mixed solution of thiocarbamate and L-cysteine,oxalic aldehyde and potassium ferricyanide as the reducing agent.The operation conditions such as acidity,KBH_4 concentration and flow capacity of carrier gas,which affect the sensitivity was optimized. The detection limit is 0.35 μg/L for arsenic and 0.12 μg/L for lead under optimal condition.The recoveries were in the range of 97.0%~103.0% for arsenic,98.7%~105.6% for lead.The method applied to the analysis of arsenic and lead in food additives had the satisfactory results.
Keywords:microwave digestion  hydride generation-atomic fluorescence spectrometry  food addition  arsenic and lead
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