差分脉冲伏安法检测茶叶中痕量铅的研究

本文旨在建立差分脉冲伏安法快速测定茶叶中的铅元素的方法,利用同位镀汞阳极溶出伏安法对茶叶样品中铅元素的含量进行测定,并对测试条件进行了优化,最终选择了我国四大茶区共29种茶叶作为样品。线性范围为40⁴00μg/L;检测限为:1.2×10^-6g/L;加标回收率为:91.1%¹04.2%;相对标准偏差（n=5）为0.86%;将测定结果与国标法检测结果进行对比,具有良好的线性关系（r=0.9979）。本研究为茶叶中铅的检测开发出了快速、简单、准确的方法,可以用于实际样品的检测。 

Determination of lead in tea by plating mercury anodic stripping voltammetry

A successfully differential pulse stripping voltammetry analysis was established for simultaneous and rapid determination of lead by mercury plating method. In this study,29 kinds of tea from four main tea areas in China were as samples.And the test conditions were optimized during experiments.The linear domain rangeed from40 μg / L to 400 μg / L and the limits of detection was 1.2 × 10^-6g / L.The studied method was applied to the detection of lead in tea samples with average recoveries of 91.1% ~ 104.2%,whose relative standard deviation( n = 5) was 0.86%.Compared with the national standard method,this result had good linear relationship( r = 0.9979). This study developed a fast,simple and accurate method for the detection of lead in tea,which can be used for the detection of real samples.