顺序注射-氢化物发生-原子荧光光谱法测定从食品接触材料迁移的痕量铅  

Sequential Injection-HG-AFS Determination of Trace Amount of Lead Migrated from Food Contacting Materials

作　　者：鲁丹 赵珊红 蒋永祥 

机构地区：[1]浙江出入境检验检疫局技术中心,杭州310017

出　　处：《理化检验（化学分册）》2013年第4期455-457,460,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家质检总局科技计划项目(2008IK166)

摘　　要：提出了顺序注射-氢化物发生-原子荧光光谱法测定食品接触材料中铅迁移量的方法。将食品接触材料样品用40g.L-1乙酸溶液浸泡,所得浸泡液稀释十倍以消除基体干扰。将此溶液以1.2%(体积分数)盐酸溶液作载流引入顺序注射分析系统,同时引入7g.L-1硼氢化钠溶液(溶于7g.L-1氢氧化钠溶液中)作还原剂。铅的质量浓度在20.0μg.L-1以内与其荧光强度呈线性关系。方法的检出限(3s)为0.031μg.L-1。以空白食品接触材料为基体,加入铅标准溶液做回收试验,测得回收率在96.6%～101%之间,测定值的相对标准偏差(n=8)在2.2%～4.4%之间。Sequential injection （SI）-HG-AFS was applied to the determination of lead migrated from food contacting materials. The sample was soaked in 40 g·L^-1 acetic acid solution, and the solution obtained was diluted ten times to eliminate matrix interference. Hydride of Pb（Ⅱ） was generated from 1.2% （9） HC1 solution with 7 g ·L^-1 NaBH4 solution （dissolved in 7 g·L^-1 NaOH solution） as reducing reagent. Linear relationship between values of fluorescence intensity and mass concentration of Pb was found in the range within 20. 0μg·L^-1 , with detection limit （3s） of 0. 031 μg·L^-1. Using blank sample of food contacting materials as matrixes,, tests for recovery and precision were made by standard addition method, values of recovery and RSD＇s （n=8） found were in the ranges of 96. 6%-101% and 2. 2%-4. 4% respectively.

关 键 词：顺序注射 氢化物发生-原子荧光光谱法 铅 食品接触材料 

分 类 号：O657.31[理学—分析化学]