摘要
将自行研制的PID光离子化检测器安装于气相色谱仪上,无需复杂的样品前处理,便可快速分析环境中的苯系物、醛类等物质。概述了此检测器的基本原理,详细介绍了其结构、电路系统的设计及性能测试结果。采用喷嘴与电极一体化的设计理念,使电离室的体积缩小到30"L,灵敏度提高,同时易于加工;微电流放大器的设计选用低噪声、低温漂的精密放大器AD549,获得了优良的信噪比与稳定的信号;选用氪灯为电离源,苯标准气体(0.9×10-6 mol/mol)为样品,仪器的检出限低于1×10-13 g/mL,定量的重复性良好;相对标准偏差(RSD)为1.24%。
Mounted the self-made photo ionization detector（PID） on a GC,the instrument could complete the fast determination of environmental contaminants such as BTEX（benzene,toluent,ethylbenzene,xylene） and aldehydes without complex pretreatment.This paper introduced its basic principle,described the structure,the electronic system and results of the application.The spray nozzle and electrode were first designed as the whole,which minimized the volume of ionization chamber to 30 μL and largely improved the sensitivity of the detector.Meanwhile,the detector was easy to assemble.The precise amplifier AD549 was selected to meet the requirements of low noise and low baseline drift,as a result,excellent signal to noise ratio and stable signal output were obtained.The lamp of Kr was selected as ionization source and the standard gas of benzene（0.9×10-6 mol/mol） was chosen as test sample.The detection limit was below1×10-13 g/mL and the quantitative repeatability was particularly good with the relative standard deviation of 1.2%.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2011年第10期1513-1516,共4页
Chinese Journal of Analytical Chemistry
