ICP-MS法测定亚热带水果中的重金属含量

摘要

A method for the determination of Pb,Cd,As,Hg elements in subtropical fruit by inductively coupled plasma mass spectrometry was established.The experiment conditions were optimized.After microwave digestion,the samples were determined by ICP-MS with Bi,In,Ge as internal standard to correct matrix interference and signal drifting.The linear range was 0.0-20.0 ng/mL for Pb,Cd,As and 0.0-2.0 ng/mL for Hg with regression coefficients of 0.999 9.The detection limits of Pb,Cd,As,Hg were 0.027,0.008,0.011,0.051 respectively.The relative standard deviations (n=6)of detection results was 3.63％-5.72％ (n=6).The recovery ranged from 90.2％ to 102.0％.The proposed method was used in determination of Pb,Cu,Cd,As,Hg in tea,rice,wheat national standard samples and the results were in conformity with standard values.%用电感耦合等离子体质谱(ICP-MS)法测定亚热带水果中Pb,Cd,As,Hg元素的含量,对实验条件进行优化,样品用微波消解法进行预处理,用Bi,In,Ge作内标校正基体干扰和漂移.Pb,Cd,As的线性范围为0.0～20.0ng/mL,Hg的线性范围为0.0～2.0 ng/mL,线性相关系数均为0.9999.Pb,Cd,As,Hg元素的检出限分别为0.027,0.008,0.011,0.051 ng/mL,测定结果的相对标准偏差(n=6)在3.63％～5.72％之间,加标回收率为90.2％～102.0％.用该法测定茶叶、大米和小麦3种国家标准物质,测定结果均在标称值范围内.