High-resolution mass spectrometric study of weathered road tars.
Shultz-JL; Sharkey-AG Jr.; Friedel-RA
J Appl Chem 1970 Apr; 20:126-128
Fractions of road tars of coke-oven and vertical retort origin were examined by high-resolution mass spectrometry before and after exposure to road conditions. Molecular formulae and relative concentrations were determined for eleven series of peaks. A progressive increase in the proportion of components of high molecular weight (> mass 200) was indicated with exposure to road conditions. In the high-molecular-weight range, the heterocyclic structures containing oxygen showed larger increases than the polynuclear aromatic hydrocarbons.
Journal of Applied Chemistry