Determination of Iodine in 45 Kinds of Food by Ashing-Gas Chromatographic Method

KeyWord:ashing  gas chromatography(GC£©  food  iodine

Abstract:

      A gas chromatographic method was developed for the determination of iodine in 45 kinds of daily food.The sample was ashed with K2CO3 and ZnSO4 solution,then dissolved with acidic water.After derivatized with butanone,the sample solution was separated by GC on a DB-1701 column,and detected with ECD detector.The external standard method was used for quantitation analysis.Effects of different ashing conditions were investigated,and the sensitivity,accuracy and precision of the method were verified.The detection limits of iodine was 1.0 ng?g-1,and the average recovery from spiked sample was 99.5%with RSD of 3.6%.The advantages of sensitivity,accurancy,short analysis time and good anti-interference made the method be suitable for the routine safety monitoring of iodine in daily food.