Figure 4

(a) Reference GC-FID chromatogram of the 24-VOC mixture. Conditions: 6-m capillary column (PDMS); He carrier gas; 50 μL loop injection; and each vapor at ~100 ppm except for acetone (500 ppm) in a Flex-foil bag in N₂. (b) Corresponding PEMM-1 chromatograms from the 5 μCR sensors. Conditions: 1 min sample at 5 mL min⁻¹; 60 s desorption at 225 °C; 2:1 split injection (3 mL min⁻¹ for analysis); He carrier gas; μcolumns at 28 °C for 0.5 min, followed by 10 °C min⁻¹ to 33 °C then 50 °C min⁻¹ to 125 °C, then hold; and μCR array at 30 °C. See Table 1 for peak assignments and text for sensor acronym definitions. Normalized response patterns (pk. ht.) shown for 7 vapors (order, l-to-r: HME/EOE/C8/TEG/OPH).