摘要
以日常食品为研究对象,建立了气相色谱测定不同食品中碘含量的检测方法。样品经碳酸钾-硫酸锌灰化处理后,采用酸水溶解,以丁酮衍生后进行气相色谱分析。经DB-1701色谱柱(30 m×0.32 mm×0.25μm)分离,电子捕获检测器(ECD)测定,以保留时间定性,峰面积外标法进行定量。考察了不同灰化条件对结果的影响,并对方法的灵敏度、准确度和精密度进行验证。碘的检出限为1.0 ng·g-1,平均加标回收率为99.5%,相对标准偏差(RSD)为3.6%。该方法灵敏、准确、可靠,且分析时间短、抗干扰性好,可用于日常食品中碘安全的监测。
A gas chromatographic method was developed for the determination of iodine in 45 kinds of daily food. The sample was ashed with KzCO3 and ZnSOa 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.
出处
《分析测试学报》
CAS
CSCD
北大核心
2015年第7期852-855,共4页
Journal of Instrumental Analysis
基金
广东省专业镇中小微企业服务平台建设项目(2013B091604003)
广东省省级科技计划项目(2014A040401032)
关键词
灰化法
气相色谱法
食品
碘
ashing
gas chromatography （GC）
food
iodine
