Figure 2From: Release of organic nitrogen compounds from Kerogen via catalytic hydropyrolysisPartial mass chromatograms (a) and (b) representing indole (m/z 117), (c) and (d) methylindoles (m/z 131), and (e) and (f) C2-alkylindoles (m/z 145) in C18 NEC SPE isolates from the hydropyrolysates generated from solvent extracted Kimmeridge Clay Formation (samples KC3 and KC4, see Table 1) (2-methylindole indicated by *).Back to article page