Ring size, average polynuclear

An Estimation of Average Polynuclear Aromatic Ring Size in an Iowa Vitrain and a Virginia Vitrain... 

High-resolution techniques for NMR in solids have been used to obtain spectra of and in an Iowa and a Virginia vitrain. The carbon spectrum separated into two well-defined peaks from which an aromatic and an aliphatic portion were estimated. A superposition of Lorentzian lines was used to represent the aliphatic and aromatic proton signals, which were not well separated under high-resolution techniques. The fractions of aromatic carbon and hydrogen thus obtained were used to estimate an average polynuclear aromatic ring size in the coals studied. 

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