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| 硅胶负载碳纳米管分离富集水中痕量银 | |
| 引用本文： | 于洪梅,孙巍,陈明丽,田永,王建华.硅胶负载碳纳米管分离富集水中痕量银[J].分析化学,2010,38(12):1721-1726. |
| 作者姓名： | 于洪梅 孙巍 陈明丽 田永 王建华 |
| 作者单位： | 1. 东北大学分析科学研究中心,沈阳,110819;辽宁科技大学化工学院,鞍山,114051 2. 辽宁科技大学化工学院,鞍山,114051 3. 东北大学分析科学研究中心,沈阳,110819 |
| 基金项目： | 国家自然科学基金(国家杰出青年科学基金(No.20725517); 重大国际合作项目(No.20821120292); 面上项目(No.20805004); 中央高校基本科研业务费(Nos.90105001,90405004,90405004)资助项目 |
| 摘 要： | 以NaOH为沉淀试剂,将水样中的Ag+在线生成Ag2O沉淀,并即时被滞留在硅胶负载的碳纳米管表面。被吸附的Ag2O沉淀用HNO3(10%,V/V)洗脱,并用火焰原子吸收法检测。当进样体积为5.4mL时,线性范围为1～120μg/L,富集系数为34.5;检出限为0.35μg/L;相对标准偏差为0.5%(40μg/L,n=7),采样频率为47次/h。结果表明:本方法的富集系数、检出限及精密度均明显优于以纯碳纳米管和纯硅胶微珠为吸附剂收集Ag2O的体系。将此系统应用于实际水样中银的测定,加标回收率在96%～108%之间。 |
| 关 键 词： | 硅胶负载碳纳米管 流动注射 分离富集 氧化银 火焰原子吸收法 |
| 收稿时间： | 21 March 2010 |
Carbon Nanotubes Loaded Silica Gel for Preconcentration of Trace Silver with Detection by Flame Atomic Absorption Spectrometry |
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| YU Hong-Mei,SUN Wei,CHEN Ming-Li,TIAN Yong,WANG Jian-Hua.Carbon Nanotubes Loaded Silica Gel for Preconcentration of Trace Silver with Detection by Flame Atomic Absorption Spectrometry[J].Chinese Journal of Analytical Chemistry,2010,38(12):1721-1726. | |
| Authors: | YU Hong-Mei SUN Wei CHEN Ming-Li TIAN Yong WANG Jian-Hua |
| Institution: | a Research Center for Analytical Sciences, Northeastern University, Shenyang 110819, China;b School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China |
| Abstract: | Carbon nanotubes(CNTs) were loaded onto the surface of silica gel(SG) beads,and the CNTs/SG composite was used as a novel adsorbent for the preconcentration of trace silver in a flow system by adsorbing nascent Ag2O in the solution.This treatment of the material significantly improved the mechanical strength and capability of preconcentration of carbon nanotubes.With NaOH as precipitating reagent,the nascent Ag2O in the solution was readily retained on the surface of the CNTs/SG composite,and afterwards,it ... |
| Keywords: | Carbon nanotubes-loaded silica gel Flow injection Preconcentration Silver oxide Flame atomic absorption spectrometry |
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