Autosampler, SPME performed using

GC-MS was performed on a Hewlett-Packard 6890 GC wifli 7683 autosampler and 5973 mass-selective detector (Agilent Technologies, Palo Alto, CA). Electron impact (El) MS was obtained at 70 eV. A split / splidess injector was used in splitless mode with a purge flow to split at 2.0 min after injection. Chromatograms were run at a constant flow of 0.5 mL /min of He gas. TTie inlet tenq>erature was set at 250 C. An HP-5MS (5% diphenyl-95% dimethylsiloxane) capillary column (30 m x 0.25 mm, 0.25 pm < ) was used with temperature programming from 60 C (1 min hold) to 300 C at 10 C/min witii a al 10 min hold. Solvent samples (1 pL) were injected by the autosampler. SPME sanqrles were manually injected by insertion of the fiber into the mass spectrometer inlet until after the purge flow to split occurred. Mass spectra were recorded from m/z 40 to m/z 550. 

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