摘要
采用原子荧光法测定茶叶中的硒含量，对样品消解温度及仪器条件进行了优化。还原剂为1.0%硼氢化钾–0.5%氢氧化钾溶液，载流液为3%盐酸溶液。在优化条件下，硒的质量浓度在0～20 ng／mL范围内与荧光强度呈良好的线性关系，相关系数r=0.999，检出限为0.8 ng／mL。该法的加标回收率为88.08％～101.39％，测定结果的相对标准偏差为2.03%～4.84％（n=6）。该方法实际操作性强，准确度高，适用于日常检验工作中对批量茶叶中硒含量的测定。
The determination of selenium in tea by atomic fluorescence spectrometry was established. The digestion temperature and instrument conditions were optimized. The reducing agent was 1.0% potassium borohydride–0.5%potassium hydroxide solution and the carrier liquid was 3%hydrochloric acid solution. Under the optimized conditions, the concentration of selenium was linear with fluorescence intensity in the range of 0–20 ng/mL,the linear correlation coefficient was 0.999. The recovery of the method ranged from 88.08%to 101.39%. The relative standard deviation of detection results was 2.03%–4.84%（n=6）. The method is feasible,has high accuracy,and it was suitable for determination of selenium in bulk tea for routine inspection work.
出处
《化学分析计量》
CAS
2014年第4期45-47,共3页
Chemical Analysis And Meterage
关键词
原子荧光法
茶叶
硒
atomic fluorescence spectrometry
tea
selenium
