基于原子荧光光谱仪的多道叠加测试技术探究  

Exploration of multichannel superposition testing technology based on atomic fluorescence spectrometer

作　　者：王永杰 李可[2] 魏丽娟 WANG Yongjie;LI Ke;WEI Lijuan(Testing Center of Tianshui Mineral Exploration Institute,Gansu Nonferrous Metal Geological Exploration Bureau,Tianshui 741024,China;Institute of Geophysical&Geochemical Exploration,CAGS,Langfang 065000,China)

机构地区：[1]甘肃省有色金属地质勘查局天水矿产勘查院测试中心,甘肃天水741024 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000

出　　处：《冶金分析》2024年第4期51-56,共6页Metallurgical Analysis

基　　金：国土资源部地质大调查项目(1212011120270);基本科研业务费项目(AS2013P03,AS2016P06)。

摘　　要：采用多通道原子荧光光谱仪(AFS)测量多种元素时,因各种元素蒸气发生时所需介质、介质的浓度及测定工作条件等的差异,往往采用相互折中的工作条件,而非各元素最佳条件,使得测定结果的灵敏度和准确性受到了限制。本文基于多通道原子荧光光谱仪,提出了多道叠加测试技术,在提高原子荧光信号强度的同时避免了引入噪声,提升了仪器的整体技术性能。在双通道原子荧光光谱仪基础上,将采用多道叠加测试技术对As和Hg的测试结果与未采用多道叠加测试技术进行比对,考察了多道叠加测试技术对仪器灵敏度、精密度、正确度等指标的改善效果。结果表明,分别测试As和Hg两个校准曲线溶液系列,As和Hg的测试灵敏度较未采用该技术时均提高了近1倍;分别对含5%(体积分数)盐酸的空白溶液连续测量11次,结果表明,As和Hg的仪器检出限较未采用该技术时均降低了一半;分别测定5.0 ng/mL As标准溶液和0.50 ng/mL Hg标准溶液,测定结果的相对标准偏差(RSD)较未采用该技术时均略有降低;分别对3个土壤标准物质中的As和Hg进行7次平行测定,测定结果的相对误差(RE)均降低了约原来的1/3。When multi-channel atomic fluorescence spectrometer is used to measure a variety of elements,due to the differences in the required medium,the concentration of the medium and the working conditions for the generation of vapors of various elements,the working conditions that compromise with each other are often used,rather than the optimal conditions for each element,which limits the sensitivity and accuracy of the measurement results.In this study,a multi-channel superposition testing technology was proposed based on the multi-channel atomic fluorescence spectrometer.The atomic fluorescence signal intensity was enhanced without the introduction of noise,thus improving the overall technical performance of the instrument.On the basis of the two-channel atomic fluorescence spectrometer,the test results of As and Hg using multi-channel superposition testing technology were compared with those without multi-channel superposition testing technology.The improvement effect of multi-channel superposition testing technology on the sensitivity,precision and trueness of the instrument was investigated.The results showed that the testing sensitivity of As and Hg increased by one-fold than that without this technology when two calibration curve solution series of As and Hg were determined separately.The blank solution of 5%(volume fraction)hydrochloric acid was determined in parallel for 11 times,and it was found that the detection limits of instrument for As and Hg were reduced by half compared with those without this technology.The standard solutions of As(5.0 ng/mL)and Hg(0.50 ng/mL)were determined according to the experimental method,and the relative standard deviations(RSD)of determination results were slightly lower compared with those without this technology.The contents of As and Hg in three certified reference materials of soil were determined in parallel for 7 times,and the relative error(RE)of the determination results was reduced by about 1/3.

关 键 词：原子荧光光谱法(AFS) 信噪比 多道叠加测试技术 砷 汞 

分 类 号：O657.31[理学—分析化学]