石墨炉原子吸收法测定萝卜中的硒

目的]建立石墨炉原子吸收法测定萝卜中硒的方法。方法]比较了Cu、Ni、Pd及Cu-Pd、Ni-Pd协同作用对硒的测定的影响,确定最佳基改剂;通过优化灯电流、灰化温度和原子化温度等确定石墨炉原子吸收法测定硒的最佳方法,并测定萝卜中的硒。结果]1mg/ml Cu(NO3)2作为基体改进剂,灰化温度800℃,原子化温度2 500℃为测定不同萝卜中硒的含量的适宜条件。在该条件下测定Se的加标回收率在99.6%～106.0%,方法相对标准偏差为1.19%,检出限为0.79μg/L。结论]该方法简便、灵敏、稳定、准确,适用于萝卜中硒的分析测定。

Graphite Furnace Atomic Absorption Method for the Determination of Selenium in Raphanus sativus L.

Objective] Determination of selenium in Raphanus sativus L.by Graphite Furnace Atomic Absorption Spectrometry.Method] Compared single ion（Cu,Ni,Pd） and mixing ion（Cu-Pd,Ni-Pd） by Graphite Furnace Atomic Absorption method for determination of selenium in improving action;To determine the optimal method for the determination of selenium by graphite furnace atomic absorption spectrometry by optimizing the lamp current,ashing temperature and atomization temperature,and determination of selenium in Raphanus sativus L..Result] The result showed that 1 mg/ml Cu（NO3）2 as matrix modifier,ashing temperature and atomization temperature in 800 ℃,2 500 ℃ for optimum conditions of selenium content in Raphanus sativus L..The recovery rate was 99.6%-106.0%,relative standard deviation is 1.19%,the detection limit is 0.79 μg/L.Conclusion] This method is simple,sensitive,stable,accurate,applicable to selenium determination in Raphanus sativus L..