新型等离子体射流原子发射光谱仪在大米中元素快速检测的应用研究  

A Novel Plasma Jet Atomic Emission Spectrometer and Its Application in Rapid Detection of Elements in Rice

作　　者：代渐雄 杨燕婷 余浩 段忆翔[4] DAI Jian-Xiong;YANG Yan-Ting;YU Hao;DUAN Yi-Xiang(College of Chemistry and Materials Science,Northwest University,Xi'an 710127,China;Chengdu West Miracle Instruments Co.,Ltd.Chengdu 611930,China;Aliben Science&Technology Co.,Ltd,Chengdu 610042,China;School of Mechanical Engineering,Sichuan University,Chengdu 610064,China)

机构地区：[1]西北大学化学与材料科学学院,西安710127 [2]成都西奇仪器有限公司,成都611930 [3]成都艾立本科技有限公司,成都610042 [4]四川大学机械工程学院,成都610064

出　　处：《分析化学》2021年第10期1686-1693,共8页Chinese Journal of Analytical Chemistry

基　　金：四川省重大科学仪器设备专项(No.2019ZDZX0036);陕西省重点研究开发计划项目(No.2019ZDLSF01-03)资助。

摘　　要：基于微波等离子体原理构建了等离子体射流原子发射光谱仪(Plasma jet atomic emission spectrometry,PJ-AES),并建立了一种新型固体样品直接分析检测技术,用于大米中镉(Cd)、锌(Zn)、铜(Cu)、铁(Fe)、磷(P)和硅(Si)等无机元素的快速检测。以大米中重金属元素Cd为目标元素,系统考察了PJ-AES的灵敏度、稳定性和线性范围等性能。此仪器对大米中重金属元素Cd(228.80 nm)的检出限为0.009 mg/kg,可测试的线性范围为0.03~1.72 mg/kg,线性相关系数R^(2)=0.998;对8组Cd浓度为0.22 mg/kg的大米标准样品进行测试,Cd(228.80 nm)的信号强度相对标准偏差(RSD)为2.8%,稳定性良好。将本方法用于实际样品中重金属元素Cd的定量检测,并与电感耦合等离子体质谱法(Inductively coupled plasma mass spectrometry,ICP-MS)的检测结果进行对比,结果表明,PJ-AES可用于大米中Cd的快速准确定性和定量检测。本仪器的研发为原子光谱提供了一种全新的固体样品直接分析检测方法,具有分析速度快、样品处理简单、成本低、检测准确和体积小等优点。A novel direct analysis technology for solid samples using an atomic emission spectrometer based on microwave plasma called plasma jet atomic emission spectrometer(PJ-AES)was developed for the first time.In the work,PJ-AES was used for the rapid detection of cadmium(Cd),zinc(Zn),copper(Cu),iron(Fe),phosphorus(P),silicon(Si)and other inorganic elements in rice.The linear range,sensitivity,stability and other properties of the PJ-AES were systematically investigated.As a result,the linear range of heavy metal element Cd(228.80 nm)was 0.03-1.72 mg/kg,and the linear correlation coefficient(R^(2))was 0.998,the detection limit was 0.009 mg/kg.A total of 8 groups of rice standard samples with a Cd concentration of 0.22 mg/kg were detected,and the relative standard deviation(RSD)of the signal intensity at 228.80 nm(Cd)was 2.8%.Finally,the method was used for quantitative detection of Cd in real samples and the obtained results were compared with that of inductively coupled plasma mass spectrometry(ICP-MS).The results showed that the PJ-AES was suitable for rapid,accurate,qualitative and quantitative detection of Cd in rice.The development of this technology provided a new direct analysis and detection method for solid samples for atomic spectroscopy.This method showed many advantages such as fast analysis speed,simple sample processing,small size,low cost,and accurate detection.

关 键 词：微波等离子体 原子发射光谱 固体样品直接检测 粮食快检 

分 类 号：O657.31[理学—分析化学] TS210.7[理学—化学]