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Anal Chem

Title:		Headspace membrane introduction mass spectrometry for trace level analysis of VOCs in soil and other solid matrixes
Author(s):		Mendes MA; Sparrapan R; Eberlin MN;
Address:		"Institute of Chemistry, State University of Campinas-UNICAMP, Brazil"
Journal Title:		Anal Chem
Year:		2000
Volume:		72
Issue:		9
Page Number:		2166 - 2170
DOI:		10.1021/ac991121o
ISSN/ISBN:		1520-6882 (Electronic) 0003-2700 (Linking)
Abstract:		"A new MIMS-derived technique, headspace membrane introduction mass spectrometry (HS-MIMS), is described for direct trace level analysis of volatile organic compounds (VOCs) in soil and other dry or wet solid matrixes. A silicone membrane interface is placed about 15 cm from the ion source, and a closed airspace (headspace) is created by connecting a toggle valve to the 1/4 in. tubing that connects the membrane interface to the ion source. For the VOC analysis, the headspace is evacuated and the solid sample vessel is heated to 90 degrees C. The VOCs are rapidly desorbed from the sample, pervaporated through the membrane, and preconcentrated for 4 min in the evacuated headspace. Then, the toggle valve is opened and the trapped VOCs are released into the ion source region of a quadrupole mass spectrometer. By electron ionization and selected-ion monitoring, a relatively sharp and intense peak is obtained and used for quantification. The HS-MIMS analysis shows excellent linearity and reproducibility and detection limits for many VOCs typically of 50-100 ng/kg (ppt)"
Keywords:
Notes:		"PubMed-not-MEDLINEMendes, MA Sparrapan, R Eberlin, MN eng 2000/05/18 Anal Chem. 2000 May 1; 72(9):2166-70. doi: 10.1021/ac991121o"