Figure 2.

Total ion chromatograms of wristband extracts through stages of cleaning and overspike on the GC-MS. All chromatograms are scaled equally to easily show differences in chromatograms. (a) A wristband background with five rounds of ethyl acetate/methanol. (b) The addition of hexane to solvent precleaning drastically reduced total background inferences. Peaks here were identified as forms of siloxanes from mass spectral comparisons to NIST libraries. (c) Notable peaks of the overspike chromatogram are labeled with corresponding PAH abbreviations.