摘要
目的:优化食品中碘提取的前处理方法,利用电感耦合等离子体质谱法测定碘含量。方法:样品经过5%四甲基氢氧化铵(TMAH)溶液于70℃水浴超声1 h,功率700 W,离心过滤后取澄清液,以碲作内标,采用电感耦合等离子体质谱仪测定碘含量。结果:方法在0.1~20.0μg·L^(-1)线性关系良好,标准系列曲线方程为Y=0.0797X+0.00424,相关系数r=0.9997,方法检出限为0.0349 mg·kg^(-1),回收率在95%以上,RSD<3%。结论:本方法缩短了前期提取时间,降低了提取温度,结果准确,重现性好,适用于不同含碘量食品的检测。
Objective:To optimize the pretreatment method for iodine extraction in food,and to determine the iodine content by inductively coupled plasma mass spectrometry.Method:The samples were sonicated in 5%tetramethylammonium hydroxide(TMAH)solution in a water bath at 70℃for 1 h with a power of 700 W.After centrifugal filtration,the clarified liquid was taken,and tellurium was used as the internal standard to determine iodine by inductively coupled plasma mass spectrometer.Result:The method has a good linear relationship in the concentration range of 0.1~20μg·L^(-1).The standard series curve equation is Y=0.0797X+0.00424,the correlation coefficient r=0.9997,and the detection limit of the method is 0.0349 mg·kg^(-1),the recovery rate is above 95%,and RSD is less than 3%.Conclusion:This method shortens the early extraction time and reduces the extraction temperature.The results are accurate and reproducible,and it is suitable for the detection of foods with different iodine content.
作者
张美玲
ZHANG Meiling(Xianju Inspection and Testing Center for Food and Drug Control,Xianju 317300,China)
出处
《现代食品》
2022年第11期181-184,188,共5页
Modern Food
关键词
碘
电感耦合等离子体质谱法
超声碱提取法
食品
iodine
inductively coupled plasma-mass spectrometery
ultrasonic alkali extraction
food
