【摘要】 将双曲面三维离子阱质谱技术与低热容气相色谱技术相结合,研制了便携式气相色谱-质谱联用仪(GC-MS)。此仪器主要由进样系统、低热容气相色谱模块、气质接口以及小型化离子阱质谱模块等构成,其主机重量小于14kg,体积为44cm×36cm×22cm,功耗小于100W。该仪器中的离子阱质谱仪系统具有15～550amu的质量范围,在全质量范围内质量分辨率优于0.5amu(FWHM),最高扫描速率可达10000amu/s,此系统还具有三级质谱分析功能。采用此便携式GC-MS分别测试环境标准样品EPA TO-14和EPA 624,结果表明,仪器具有定性能力强、分析速度快、检测灵敏度高、功耗小以及便携性能优等特点,可对空气、水体、固态废弃物中的有毒有害物质进行现场分析和检测。更多还原

【Abstract】 A portable gas chromatograph-mass spectrometer(GC-MS) was developed based on a quadrupole ion trap(IT) mass analyzer and a low thermal mass GC.The portable GC-MS system,mainly composed of a sample system,a low thermal mass GC module,a GC-MS interface and a miniaturized ITMS system,has a dimension of 44 cm×36 cm×22 cm and weighs of 14 kg.The power consumption during sample analysis is about 100 W.The ITMS system has a mass range of m/z 15-550 and can give a mass resolution at full-width half-maximum(FWHM) of less than 0.5 amu at a high scan rate up to 10,000 amu/s.Furthermore,the ITMS system has the ability of performing three-stage tandem mass spectrometry.The performance of the portable GC-MS system was investigated by testing the volatile organic compounds(VOCs) standard including EPA TO-14 and EPA-624 by this system.The portable GC-MS system can be used for in situ analysis of hazard compounds in a variety of complex and harsh environments with portability,rapid response,low detection limit and high specificity.更多还原