扩散－电极法测定食品中氟  

Determination of fluoride in foods by microdiffusion and fluoride-specific electrode

作　　者：林少彬[1] 王倩[1] 陈昌杰[1] 陈亚妍 刘原[1] 

机构地区：[1]中国预防医学科学院环境卫生监测所

出　　处：《卫生研究》1995年第2期111-113,共3页Journal of Hygiene Research

基　　金：世界卫生组织资助项目

摘　　要：样品中氟在扩散盒中与硫酸作用生成氟化氢，经扩散吸附在扩散盒的碱膜上。碱膜用缓冲液溶解后，氟化物含量由氟离子选择电极测定。用本法对菜花、菠菜、大米、鱼片干四种样品以及玉米氟样品的氟进行了精密度和准确度试验。相对标准偏差在５％以内，回收率为９０％～１０３％，最小检测量为０．２４μｇ。该法可直接测定含氟量在０．５～１００ｍｇ／ｋｇ（干重）的食品。The hydrogen fluoride is formed in samplereacted with H2SO4 in a polystyrene petri dish which is diffused and absorbed to inside of lid of the disk covered with a layer of NaOH.The laver absotbed with hydrogen fluoride is dissolved in TISAB buffer and the fluoride is measured potentiometrically.The fluoride in standard reterence material of broccoli,spinach,rice,dry fish meat and the corn of was determined by this method on precision and accuracy.The relative standard deviation was less than 5%.The recovery varied from 90% to 1 03%.Detection limit was 0.24μg.This method can be used to determine fluoride in foods ranging from 0.5 mg/kg to 103 mg/kg dry weight samples.

关 键 词：氟化物 扩散-氟电极 食品检验 

分 类 号：R151.3[医药卫生—营养与食品卫生学]