摘要
以铋膜修饰玻碳电极为工作电极,采用差分脉冲溶出伏安法对茶叶及茶叶浸出物中微量Pb^(2+)进行分析。结果表明,Pb^(2+)在5~300μg·L^(-1)范围内与峰电流呈良好的线性关系,检出限为0.39μg·L^(-1),相对标准偏差为1.98%(n=11),线性方程为I_p=0.023 6ρ(Pb^(2+))-0.098 4,相关系数r=0.999 2,茶叶样品中铅含量为0.53~2.98 mg·kg^(-1),加标回收率为91.5%~113.5%;茶叶浸出物中未检出铅,加标回收率在93.6%~99.5%。
Bismuth film modified glassy carbon electrode was used for working electrode to determine trace Pb2 +in the tea and water extraction by differential pulse stripping voltammetry(DPSV). The results showed that there was a good linear relationship between peak current and concentration of Pb2+in the range of 5-300 μg·L-1,the regression equation was Ip=0.023 6 ρ(Pb2+)-0.098 4, and the detection limit was 0.39 μ g·L-1, RSD(n=11)was 1.98% and correlation coefficient r was 0.999 2. The rang of Pb2+contents in tea was 0.53-2.98 mg·kg-1. The standard addition recovery for Pb2+in tea and its extraction ranged from 91.5%-113.5% and 93.6%-99.5%,respectively.
出处
《安徽工业大学学报(自然科学版)》
CAS
2017年第2期146-150,共5页
Journal of Anhui University of Technology(Natural Science)
基金
安徽省高校自然科学研究重点项目(KJ2016A099)
关键词
铋膜电极
差分脉冲溶出伏安法
铅
bismuch film electrode
differential pulse stripping voltammetry
lead