氢化物发生-原子荧光光谱法测定烟叶中的镉  

Study on the Determination of Cadmium in Tobacco byHydride Generation-Atomic Fluorescence Spectrometry

作　　者：蒋倩[1] 王如海[1] 孙晓丽[1] 龚华[1] 孙玉芳[1] 倪俊[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与环境分析测试中心,南京210008

出　　处：《中国农学通报》2010年第13期118-121,共4页Chinese Agricultural Science Bulletin

基　　金：中国科学院知识创新工程领域前沿项目"原子荧光测定土壤/植物中Pb/Cd的研究"(ISSASIP0727)

摘　　要：采用HNO3-HClO4-H2O2体系湿法消解烟叶样品,摸索出氢化物发生-原子荧光光谱法测定样品中镉(Cd)的最佳试验条件。其条件为:样品酸度1%HCl、载流浓度2%HCl、还原剂浓度2%KBH4与0.5%KOH混合溶液、增敏剂Co2+1.5mg/L,硫脲0.5%以及仪器设置最佳参数。结果显示:在所选择的试验条件下,测定镉的检出限为0.0031μg/L,线性范围为0.00～3.00μg/L,样品测定变异系数小于3.0%,加标回收率为88.7%～99.5%。该方法测定烟叶中Cd结果准确可靠、稳定性及精密度较高,是一种有效的测定方法。Tobacco samples were dissolved by HNO3-HClO4-H2O2. Then, the concentration of Cadmium （Cd） was determined by hydride generation-atomic fluorescence spectrometery （AFS） with the best experimental conditions and instrumental settings, including the concentrations of the acidity of samples （1%HCl）, carrier flow （2% HCl）, reducer （2% KBH4＋0.5% KOH）, Co2＋ （1.5 mg/L）, CH4N2S （0.5%） and the best settings of AFS. Under the optimal experimental conditions, the detection limits of Cd was 0.0 031μg/L, and the linear scope was during 0.00 and 3.00 μg/L, and the C.V. of the sample was less than 3.0%, and the recovery rate was 88.7%-99.5%. Therefore, the method characterized by veracity, stabilization and high precision will be effective to determine Cd in Tobacco. tobacco; cadmium

关 键 词：原子荧光光谱法 烟叶 镉 

分 类 号：O657.31[理学—分析化学]