Abstract
Differential-pulse voltammetry at the hanging-mercury-drop electrode was used to characterise coal derivatives. Polycyclic aromatic structures present both in anthracene oils and in the more complex molecules of the asphaltenes from high-yield coal extracts were identified by comparison of half-wave potentials with those of a range of pure compounds. The aromatic structures identified in the asphaltenes are similar to those in the 'average' structures deduced by nuclear magnetic resonance methods. For coal-tar distillate oils, quantitative analyses were possible and are in satisfactory agreement with results from capillary gas chromatography.
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