Abstract
Current-potential curves of suspended coal (Sulcis basin, Sardinia, Italy) in 85% H 3PO 4 were taken on a platinum electrode at 100 °C. Anodic current in the potential range of 0–1.5 V versus saturated calomel electrode was due to some humic acid-type substances released by coal in the electrolyte. The leaching of organic matter increased with the lowering of the particle dimensions, and the related oxidation currents attained stable values even during slurry formation. Current-potential curves were still unchanged when coal was filtered off from the suspension. Previous washing of ground coal with diluted mineral acids, including H 3PO 4, did not dissolve any significant amount of the substances responsible for the electrochemical activity of the coal sample examined.
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