可移动激光质谱仪的研制与应用

激光质谱法是一种新的环境测污方法，具有高灵敏度、高选择性、多组分同时测量和快速实时的特点。本研究介绍了新近研制的可移动激光质谱仪的系统结构、各部分功能、原理以及主要技术指标。该仪器能在大气压下采样，并在设计过程中解决了记忆效应，使用输出波长248nm的KrF准分子激光器，可以对芳香烃进行多组分同时检测。该仪器对机动车尾气中苯系物含量的实时在线测量结果表明，尾气中含有苯、甲苯、二甲苯、三甲苯、萘、甲基萘等多种芳香烃污染物，检测的灵敏度达0．1mg／m^3，时间响应可达0．1s。

Development and Applications of Mobile Laser Mass Spectrometer

Laser mass spectrometry is a new method for detection of environmental pollution. In this paper, the principle and features of our newly constructed instrument, called mobile mass spectrometer were described in detail. The features of it is to achieve high sensitivity (0.1 mg/m 3), high selectivity, multicomponent detection, high speed (0.1 s) and real time. This paper presents the systematic structure, function of every parts and key specification of this instrument in detail. We also report some solved key technological problems in the process of development and design such as memory effects and the great pressure difference between flue gas and vacuum chamber. At last, we give some real-time on-line monitoring results obtained from a motorcycle exhaust gas by the instrument. A KrF excimer laser(248 nm,2.5 ns) was used in all experiments, and some aromatic carbons pollutant such as benzene,toluene,xylene,C 3-benzene,naphthalene,and methyl- naphthalene were detected.