Abstract
ONE of the main features of the chemical composition of the black glutinous muds of relatively high organic content in the Sierra Leone River Estuary is their high content of sulphide. Work carried out by the Rice Research Station at Rokupr on the Scarcies River, some 30 miles north of the Sierra Leone River estuary, suggests that the principal source of oxidizable sulphur in these estuarine soils is iron disulphide, or possibly some other polysulphide1. The presence of sulphide in marine muds has been ascribed by various authors to a number of causes. It may be produced by the way of bacterial decomposition of organic matter containing sulphur. On the other hand, it is known that certain bacteria in the presence of organic material can reduce sulphates to sulphides; this reaction probably accounts for the presence of ferrous sulphide in marine muds in many parts of the world.
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