石墨炉原子吸收法测定食用菌中硒

采用石英高压消化罐在较低温度下进行缓慢样品消化，减少了消化过程中硒的损失。利用石墨炉原子吸收法对食用菌中硒的含量进行测定。1% Ni(NO₃)₂作为基体改进剂，灰化温度为500 ℃，原子化温度为2 500 ℃时，经氘灯校正背景，测定食用菌中硒含量，回收率在92.1%～115.5%之间，方法的相对标准偏差为1.28%，检出限为15.8 μg·L-1，该法具有简便、快速、灵敏、稳定、准确等优点，适于食用菌中痕量硒的分析测定。

Determination of Trace Selenium in Edible Fungi with Graphite Furnace Atomic Absorption Spectroscopy

In the present article, samples were digested by a quartz high-pressure digestion pot, reducing the loss of selenium in digestion. The content of selenium in edible fungi was determined by using graphite furnace atomic absorption spectroscopy, and the results showed that when the content of selenium in edible fungi was determined by using 1% Ni(NO3)2 as a matrix modifier, ashing temperature of 500 degreed C, and atomization temperature of 2 500 degrees C, and rectifying background by deuterium light, the recovery was in the range of 92.1%-115.5%, the relative standard deviation of the method was 1.28%, and the limit of detection was 15.8 microg x L(-1). The method was suitable for the determination of trace selenium in edible fungi with the advantages of being simple, rapid, sensitive, stable and accurate etc., and the results were satisfactory.