Figure 2.

GC-MS chromatograms of derivatized aldehyde and ketone standards, the serpentine mineral analogue blank, and the Murchison meteorite extract, and a GC-IRMS chromatogram of carbonyl compounds in the Murchison sample measured for δ¹³C. GC-MS peaks in the upper three chromatograms represent PFBHA derivatives, containing the characteristic ion of m/z= 181.0. The lower GC-MS chromatogram is a total ion chromatogram (TIC). The GC-IRMS chromatogram shows the m/z= 44 (¹²CO₂ peak) measured during carbon compound-specific isotope analysis. Peak R represents unreacted PFBHA derivatization reagent. The identities of the labeled peaks are presented in Table 1.