Changes

==Example of MRM==

==Example of MRM==

[[file:oiloil-and-oilsource-rock-correlations_fig8-22.png|300px|thumb|{{figure number|2}}MRM output for steranes from the Lufa oil seep in Papua New Guinea. Copyright: Murray et al. (1993); courtesy Australian Geological Survey Organization.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-22.png|300px|thumb|{{figure number|2}}MRM output for steranes from the Lufa oil seep in Papua New Guinea. Copyright: Murray et al.;<ref name=Maurray1993>Murray, A. P., R. E. Summons, J. Bradshaw, and B. Pawih, 1993, Cenozoic oil in Papua New Guinea—evidence from geochemical analysis of two newly discovered seeps, in G. J. Carman and Z. Carman, eds., Petroleum Exploration and Development in Papua New Guinea: Proceedings of the Second PNG Petroleum Convention, Australian Geological Survey, p. 489–498.</ref> courtesy Australian Geological Survey Organization.]]

[[:file:oiloil-and-oilsource-rock-correlations_fig8-22.png|Figure 2]] shows MRM output for steranes from the Lufa oil seep in Papua New Guinea. The same sample was also discussed in [[Data obtained by gas chromatography]]. Each fragmentogram monitors the transformation of a particular molecular ion to the designated daughter ion. The top four traces monitor conversion to the m/z 217 fragment ion from four different sizes of original sterane molecules. The top chromatogram represents the decomposition of methylsteranes (molecular weight = 414 daltons), and through its very low relative intensity at 100% scale (1.7) shows these compounds to be present in minor amounts. The next three chromatograms are for the C₂₉, C₂₈, and C₂₇ steranes, respectively. From the relative concentrations (24.4, 10.6, and 15.8) of these fragments, we see the C₂₉ species is dominant. The fifth chromatogram monitors 4-methylsteranes, which in this sample represent only minor components. The last two fragmentograms, in contrast, monitor two different bicadinane species.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-22.png|Figure 2]] shows MRM output for steranes from the Lufa oil seep in Papua New Guinea. The same sample was also discussed in [[Data obtained by gas chromatography]]. Each fragmentogram monitors the transformation of a particular molecular ion to the designated daughter ion. The top four traces monitor conversion to the m/z 217 fragment ion from four different sizes of original sterane molecules. The top chromatogram represents the decomposition of methylsteranes (molecular weight = 414 daltons), and through its very low relative intensity at 100% scale (1.7) shows these compounds to be present in minor amounts. The next three chromatograms are for the C₂₉, C₂₈, and C₂₇ steranes, respectively. From the relative concentrations (24.4, 10.6, and 15.8) of these fragments, we see the C₂₉ species is dominant. The fifth chromatogram monitors 4-methylsteranes, which in this sample represent only minor components. The last two fragmentograms, in contrast, monitor two different bicadinane species.