Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 917, Issue 1-2, Pages 205-217Publisher
ELSEVIER
DOI: 10.1016/S0021-9673(01)00656-2
Keywords
radio-frequency ion mobility spectrometry; detection, GC; volatile organic compounds; pheromones; aldehydes; ethers; esters; alcohols
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A high electric field, radio-frequency ion mobility spectrometry (RF-IMS) analyzer was used as a small detector in gas chromatographic separations of mixtures of volatile organic compounds including alcohols, aldehydes, esters, ethers, pheromones, and other chemical attractants for insects. The detector was equipped with a 2 mCi Ni-63 ion source and the drift region for ion characterization was 5 mm wide, 15 mm long and 0.5 mm high. The rate of scanning for the compensation voltages was 60 V s(-1) and permitted four to six scans to be obtained across a capillary chromatographic elution profile for each component. The RF-IMS scans were characteristic of a compound and provided a second dimension of chemical identity to chromatographic retention adding specificity in instances of co-elution. Limits of detection were 1.6-55X10(-11) g with an average detection limit for all chemicals of 9.4X10(-11) g. Response to mass was linear from 2-50X10(-10) g with an average sensitivity of 4 pA ng(-1). Separations of pheromones and chemical attractants for insects illustrated the distinct patterns obtained from gas chromatography with RF-IMS scans in real time and suggest an analytical utility of the RF-IMS as a small, advanced detector for on-site gas chromatographs. (C) 2001 Elsevier Science B.V All rights reserved.
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