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Optimal SPME conditions for VOC profiling. (a) The GC–MS spectra of a representative sample using DVB/CAR/PDMS SPME extraction with extraction time = 30 min, extraction temperature = 80 °C. (b) The GC–MS spectra at the optimal DVB/CAR/PDMS SPME extraction temperature (60 °C). (c) The GC–MS spectra at the optimal DVB/CAR/PDMS SPME extraction time (20 min).
