摘要
建立微波消解-原子荧光光谱法测定植物样品中砷和硒的含量。微波消解后残留的有机颗粒和硝酸等会对测定结果造成影响,因此需要将硝酸除尽。在驱除硝酸过程中加入高氯酸,加热至溶液冒白烟,避免硒挥发损失。该方法砷、硒的检出限分别为6.8,4.0 ng/g(稀释因子40),测定结果的相对标准偏差分别为3.65%,3.52%(n=12),加标回收率分别为94.5%~104.6%,92.2%~98.9%。经过国家一级标准物质验证,该方法准确可靠。
Microwave-atomic fluorescence spectroscopy was established to determine arsenic and selenium in plant samples.The organic residues and nitric acid left after microwave digestion needed to be eliminated as it would have influence on the determination.However,to avoid the volatile loss of selenium in the process of acid-driving,perchloric acid was added into the solution and the solution was heated to smoke as the end.The detection limits of this method for arsenic and selenium were 6.8 and 4.0 ng/g(dilution factor is 40),respectively.The relative standard deviations for arsenic and selenium were 3.65%and 3.52%(n=12),respectively.The recoveries were 94.5%-104.6%and 92.2%-98.9%,respectively.This method was applied to the determination of arsenic and selenium in national first-class standard reference materials and the analytical results were in agreement with the certified values.
作者
马娜
顾雪
张灵火
于兆水
陈海杰
MA Na;GU Xue;ZHANG Linghuo;YU Zhaoshui;CHEN Haijie(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China)
出处
《化学分析计量》
CAS
2020年第1期9-12,共4页
Chemical Analysis And Meterage
基金
国家重点研发计划项目(20160116)
地质大调查项目(DD20190518,DD20190522)
物化探所中央级公益性科研院所基本科研业务费专项(AS2016J13)
关键词
微波消解
原子荧光光谱法
植物样品
砷
硒
microwave digestion
hydride-atomic fluorescence
plant
arsenic
selenium
