Experimental Upgrades of Membrane Introduction Mass Spectrometry for Water and Air Analysis

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• 作者：Paola Bocchini ; Romina Pozzi ; Christian Andalò ; and Guido C. Galletti
• 刊名：Analytical Chemistry
• 出版年：2001
• 出版时间：August 15, 2001
• 年：2001
• 卷：73
• 期：16
• 页码：3824 - 3827
• 全文大小：79K
• 年卷期：v.73,no.16(August 15, 2001)
• ISSN：1520-6882

文摘

Some improvements to the membrane introduction massspectrometry (MIMS) technique, resulting in low-pptdetection limits for volatile organohalogen compounds(CX) in water (namely, chloroform, bromoform, bromodichloromethane, chlorodibromomethane, tetrachloroethylene, trichloroethylene, 1,1,1-trichloroethane, andcarbon tetrachloride) and low-microgram per cubic meterdetection limits for benzene, toluene, ethylbenzene, andxylenes (BTEX) in gaseous samples, are shown. A staticMIMS configuration was compared to a dynamic one, theformer requiring longer time to obtain the analyticalresponse. A cryotrapping preconcentration step is introduced and linearity of response, mixture effects, anddetection limits are presented. The instrumental setupconsists of a hollow fiber silicone membrane, a water orair container, a cryofocusing trap based on Tenax adsorbent, a Peltier cell, and a Varian ion trap benchtop massspectrometer is described. This instrumental setup, whichwe named membrane extraction trap focusing massspectrometry, allowed the detection of CX in water at aconcentration as low as 8 ppt and of benzene in air at 0.1g/m³. The whole assembly shows great potential for on-site routine monitoring of drinking water resources andurban and indoor air under current EU and Italianregulations.