纳米ZnO吸附分离-氢化物原子荧光光谱法测定硒  

Determination of Trace Selenium by HG-AFS Using Nano-ZnO as an Adsorption-separating Material

作　　者：李阳[1] 李国涛[1] 定雅雪 黄婷[1] 

机构地区：[1]安康学院化学化工系,陕西安康725000

出　　处：《安康学院学报》2015年第1期90-93,共4页Journal of Ankang University

基　　金：陕西省大学生创新创业训练计划项目(2013sxjy004);安康市科技研究发展计划项目(2013AK-08);安康学院培育项目(2013AYPYZR01)

摘　　要：本文研究了纳米ZnO在水相体系中对痕量硒的吸附特性。在最佳实验条件下,硒定量、快速地吸附在纳米ZnO材料上,在0℃、60℃、80℃时,最大吸附容量分别为31.45 mg·g-1、31.75 mg·g-1、31.95 mg·g-1,等温吸附线符合可逆的Langmuir吸附模型。在硼氰化钾-盐酸体系中,最佳测定条件下,用氢化物发生-原子荧光光谱法测定硒,线性方程为IF=82.778CSe＋9.04,相关系数R2=0.9997,线性范围0.1-20μg·L-1。该方法的检出限为0.05μg·L-1,回收率为94%∽106%,相对标准偏差不大于4.24%,适用于定量、快速、准确测定环境水样中的痕量硒。The adsorption behavior of nano-ZnO towards trace amount of selenium ions in water phase system was investigated. Under the optimum conditions,Se（IV） ions could be adsorbed and recovered quantitatively. The maximum adsorption capacity of selenium ions on nano-ZnO was 31.45 mg g-1,31.75 mg g-1,31.95 mg g-1at 0℃,60℃ and 80℃,respectively. The Langmuir model could describe the adsorption of nano-ZnO to Se（IV） ions successfully over the whole range of concentration studied. The selenium was determined by hydride generation-atomic fluorescence spectrometry（HG-AFS） with KBH4-HCl. The calibration equation is IF=82.778CSe＋9.04 with a correlation coefficient of 0.9997,and the calibration graph was linear in the range of 0.1∽20 μg·L-1for selenium. The detection limit of method is 0.05 μg·L-1and the recoveries is 94∽106%. The relative standard deviations（n=7） are less than 4.24 %. The method has been applied to the determination of trace selenium in some environmental samples quantitatively,quickly and accurately.

关 键 词：氢化物-原子荧光光谱法 纳米ZNO 硒 吸附 

分 类 号：O652.6[理学—分析化学]