石墨炉原子吸收法测定草莓中铅的方法优化

Optimization of determination of lead in strawberry by graphite furnace atomic absorption spectrometry

中文关键词:  石墨炉原子吸收法  铅  基体改进剂  氘灯扣背景  升温程序

英文关键词:Graphite Furnace Atomic Absorption Spectrometry  Lead  matrix modifier  deuterium lamp dedution background  The temperature program

中文摘要:

      目的 建立石墨炉原子吸收法检测草莓中铅含量的方法, 实现对草莓中铅含量准确检测。方法 分别对不加基体改进剂的方法和加入基体改进剂的3种方法的检出限和相关性进行初步筛选; 主要对石墨管升温程序进行优化, 并通过加标回收实验来确认最佳方法。结果 在最佳方法下检测草莓中铅含量, 在0~100 ng/mL浓度范围内线性关系良好, 相关系数为0.99625, 检出限为9.5 μg/kg; 平均加标回收率为89.0%~94.4%, 变异系数为4.42%~14.61%。结论 优化的方法相关性好, 检出限低, 精密度好, 可实现对草莓中铅的准确检测。

英文摘要:

      Objective To established a method for the determination of lead in strawberry by graphite furnace atomic absorption spectrometry, and achieve accurate detection of lead in strawberry. Methods The limits of detection and correlation of the method without matrix modifier and three methods with matrix modifier were screened, the graphite tube heating program was mainly optimized, and the best method was confirmed by standard addition recovery test. Results The lead content in strawberry was detected under the best method, and the linear relationship was good in the concentration range of 0-100 ng/mL. The correlation coefficient was 0.99625 and the limit of detection was 9.5 μg/kg. The average standard recoveries were 89.0%-94.4%, and the coefficients of variation were 4.42%-14.61%. Conclusion The optimized method has good correlation, low detection limit and high precision, which can be used for accurate detection of lead in strawberries.