The insoluble matter of coal tar III. Some inorganic constitutents of free carbon

Abstract

The inorganic constituents of coals are bricfly reviewed and their subsequent history during combustion and carbonization is considered. The cxamination is reported of the zinc‐pyridine complex obtained from a free carbon sample by extraction with water. Examination for other elements is described and the presence of lead, iron, cobalt, manganese and others indicated. The form in which these elements are present is discussed.