摘要
目的建立茶叶中镍的石墨炉原子吸收光谱测定方法。方法样品经微波消解后,分别以20 g/L磷酸二氢铵、0.2 g/L氯化钯、0.2 g/L氯化钯-20 g/L磷酸二氢铵溶液作为基体改进剂,800℃灰化,用石墨炉原子吸收分光光度法测定,氘灯扣除背景,标准曲线定量。结果以0.2 g/L氯化钯溶液为基体改进剂,能明显改善峰形和提高检测灵敏度。方法的标准曲线溶液浓度在0.0 ng/ml^50.0 ng/ml时,线性关系良好,其回归方程为y=0.009 6x+0.048 3,相关系数(r)为0.999 5,最低检出限为0.02 mg/kg,相对标准偏差为3.07%~4.07%,低、中、高3种镍浓度加标回收率分别为101.5%、98.4%、98.9%。结论本方法具有快速、简单、准确的特点,可满足茶叶中的镍检测。
Objective To establish a method for the determination of nickel in tea by graphite furnace atomic absorption spectrometry.Methods After microwave digestion,use 20 g/L ammonium dihydrogen phosphate,0.2 g/L palladium chloride,0.2 g/L palladium chloride and 20 g/L ammonium dihydrogen phosphate solution as matrix modifier,respectively.Set 800 ℃as ashing temperature,deduct background with deuterium lamp,quantify the standard curve line via graphite furnace atomic absorption spectrometry.Results It was showed that using 0.2 g/L palladium chloride solution as matrix modifier could significantly improve the peak shape and the detection sensitivity.The method had good linearity correlation when the concentration of standard curve solution was within 0.0 ng/ml-50.0 ng/ml,and the regression equation was y =0.009 6x＋0.048 3,with r=0.999 5.The lowest detection limit of the method was 0.02 mg/kg,and the relative standard deviations were within 3.07%-4.07%.The standard addition recoveries of low,medium and high concentration of nickel were respectively 101.5%,98.4%and 98.9%.Conclusion This method is rapid,simple and accurate,and suitable for the determination of nickel in tea.
出处
《中国卫生检验杂志》
CAS
2016年第16期2310-2311,2315,共3页
Chinese Journal of Health Laboratory Technology
关键词
镍
石墨炉原子吸收光谱法
茶叶
氯化钯基体改进剂
Nickel
Graphite furnace atomic absorption spectrometry
Tea
Palladium chloride matrix modifier
