手持固相萃取装置用于水砷现场分析  

A handheld solid phase extraction device for water arsenic field analysis

作　　者：杨睿婕 杨嘉慧 张若曦[1] 郑成斌[3] YANG Rui-jie;YANG Jia-hui;ZHANG Ruo-xi;ZHENG Cheng-bin(College of Ecology and Environment,Chengdu University of Technology,Chengdu 610059,China;Analytical&Testing Center,Sichuan University,Chengdu 610064,China;College of Chemistry,Sichuan University,Chengdu 610064,China)

机构地区：[1]成都理工大学生态环境学院,四川成都610059 [2]四川大学分析测试中心,四川成都610064 [3]四川大学化学学院,四川成都610064

出　　处：《化学研究与应用》2023年第11期2660-2667,共8页Chemical Research and Application

基　　金：“食品安全关键技术研发”国家重点专项(2019YFC1604802)资助。

摘　　要：简便、快速、可操作性强的样品前处理方法是小型化原子光谱仪现场应用的关键。本实验构建了一种基于二氧化钛纳米管阵列(TiNTs)的手持式搅拌吸附仪,结合氢化物发生尖端放电微等离子体原子发射光谱法(HG-μPD-OES)对水中的砷进行现场分析。采用阳极氧化法合成TiNTs吸附片,将吸附片装载在小型搅拌电机上组成手持式自动化搅拌吸附仪,对地表水中的砷进行快速富集。富集后的砷经氢氧化钠溶液解析后泵入反应管中进行氢化物发生反应,生成的挥发性产物被载气吹扫进入尖端放电微等离子体中进行激发,采用手持式电荷耦合器件(CCD)采集砷的特征发射线及强度实现定性定量分析。在最优实验条件下,砷的检出限为0.02μg·L^(-1),相对标准偏差优于6.5%,富集因子为53.4。通过对成都市多个河流湖泊进行水砷现场测定,并与ICP-MS的测定结果对比,验证了本方法的实用性和准确性,为快速、准确、灵敏的水砷现场分析提供了广阔的应用前景。Simple,fast,and operable sample pretreatment method is the key to the field application of miniaturized atomic spectrom-etry.Based on titanium dioxide nanotube arrays(TiNTs),a hand-held agitator adsorber was developed and combined with hydride generation point discharge microplasma atomic emission spectrometry(HG-μPD-OES)to determine arsenic in surface water.TiNTs adsorption sheet was synthesized by an anodic oxidation method,which was constructed to a handheld automatic agitator adsorber driven by a small stirring motor to achieve rapidly and dynamically enrich arsenic in water.After desorption in NaOH solution,the desorption liquid was pumped into the reaction tube reactor for hydride generation,and the resulting volatile products were purged by a carrier gas into the microplasma for excitation.A handheld charge-coupled device(CCD)was used to collect signals from the characteristic emission lines and its intensity of arsenic to accomplish qualitative and quantitative analysis.Under the optimal exper-imental conditions,the detection limit of arsenic was 0.02μg·L-',the relative standard deviation was better than 6.5%and the enrichment factor was 53.4.The practicability and accuracy of this method are verified by comparing the results of water arsenic in many rivers and lakes in Chengdu with those of ICP-MS,which provides a broad application prospect for the rapid,accurate,and sensitive field analysis of arsenic in water.

关 键 词：砷 二氧化钛纳米管 尖端放电微等离子体 原子发射光谱 现场检测 

分 类 号：O657.3[理学—分析化学]