isperse Method—The optimized parameters for disperse dyes were also verified by analyzing fiber extracts. Figure 6 shows the chromatogram and mass spectra of the extract of a 0.5 cm single fiber removed from C.I. Disperse Orange 25 dyed fabric (see Table 1 for additional dye information). The formula weight of this dye is 323 amu and the chromatogram has a peak with an m/z value of 323.9. This [M+H]+ ionization is characteristic of the electrospray positive ionization method. In addition to the dye peak, there are other unidentified peaks in the chromatogram. An undyed fiber was extracted and analyzed using the same method, yielding similar chromatographic peaks. Although these peaks have not yet been identified, they are most likely from the processing or manufacturing of the fiber in that they are consistent throughout all of the extracts for the same fiber type.
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