We describe efforts to characterize the response of a miniature gas chromatograph and to assess its suitability for field studies of vapor phase volatile organic compounds. The Vernier (Beaverton, OR) Mini GC is a small (1.3 kg, 2.7 L), power-efficient (24 VDC, 60 W) gas chromatograph. Although intended for the educational market, we are evaluating it for use as a portable instrument for the field screening of volatile organic compounds (VOCs). The Mini GC contains an 11 meter capillary column (polydimethylsiloxane, inner diameter 0.53 mm, 30 �C-160 �C) with the capability of temperature programming. The mobile phase is ambient air, pulled through the column by a small pump (flow rates of 1.4 to 10.8 mL/min available). Sample introduction is through on-column injection, with injection of both liquid (up to 0.8 microliters) and air containing organic vapors (up to 1 mL) possible. Detection of column effluent is accomplished using a solid-state, �chemicapacitive� sensor. Data are collected by Vernier LoggerPro software on either a laptop or handheld device. We are investigating the effects of sample composition and injection size on chromatographic retention times, peak area and peak shape. Analyte calibration curves, including statistically-based limits of detection will be presented. Preliminary data suggest that the Vernier Mini GC maybe a promising instrument for field screening of vapor phase volatile organic compounds.

Investigating the response of a miniature gas chromatograph

247th National Meeting (2014)

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