Py-GCMS

Watts, S., Pollard, A. M. and Wolff, G. A. (1999). The organic geochemistry of jet Pyrolosis-gas chromatography/mass spectrometry (Py-GCMS) applied to identifying jet and similar black lithic materials - preliminary results. Journal of Archaeological... 

Product characterization from liquefaction has not been extensive. Phi 1p and Russell (95) have examined products by Py-GCMS from metal halide catalyzed hydrogenation of a vitrinite, alginite, and inertinite, each from a different source. They were able to correlate Py-GCMS results with reaction temperature. King, et al. (96) examined the short contact time liquefaction of macerals separated by DGC from a single hvB bituminous coal. They found correlations between density and reactivity and composition of the products. 

A third approach is pyrolysis gas chromatography-mass spectroscopy (Py-gcms). This is a hybrid of the two previous methods, in which the pyrolysis products are separated by gc and then injected directly into an on-line MS, often a small quadrupole instrument. The gc serves to give rapid separation of the products where the MS acts both as a gc detector (in total ion current mode) and as an analytical tool. 

A third approach is pyrolysis gas chromatography-mass spectroscopy (Py-gcms). This is a hybrid of the two previous methods, in which the... 

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