石墨炉原子吸法测定陇南茶叶中镉和钴

Determination of Trace Cadmium and Cobalt in Longnan Tea with Graphite Furnace Atomic Absorption Spectroscopy

采用微波进行样品消化，减少了消化过程中元素的损失。利用石墨炉原子吸收法对陇南茶叶中镉钴的含量进行测定。1000mg·L^-1 pd（CD2和1％的Vc溶液5μL作为基体改进剂，经氘灯校正背景，测定钻和镉含量，回收率分别在98．1％～106．5％和97．2％-102．6％之间，方法的相对标准偏差分别为4．5％和5．1％，检出限分别为0．50ngmL^-1和1．60ngmL^-1，该法具有简便、快速、灵敏、稳定、准确等优点，适于茶叶中镉钴的分析测定。

In the present article ,. samples were digested by microwave digestion pot, reducing the loss of element in digestion. The content of Cadmium and Cobalt in Longnan Tea was determined by using graphite furnace atomic absorption spectroscopy, and the results showed that when the content of Cadmium and Cobalt in Longnan Tea was determined by using 1000 mg.L^-1 Pd（Cl）2 andl % Vc as a matrix modifier, and rectifying background by deuterium light, the recovery was in the range of 98.1%- 106.5 % and 97.2 %-102.6 %, the relativestandard deviation of the method was 4.5 % and 5.1%, and the limit of detection was 0.50ngomL^-1 and 1.60ng.mL^-1. The method was suitable for the determination oftrace Cadmium and Cobalt in Longnan Tea of being simple, rapid sensitive.stable and accurate etc and the results were satisfactory.