"A method is described for the determination of ferrous iron contents in shales containing organic matter up to 4 per cent carbon equivalent. After initial attack on the shale the ferrous iron is made to react with iodine monochloride and the liberated iodine titrated against standard potassium iodate. The value of ferrous iron determinations in shales is illustrated by consideration of the composition of various members of a British Coal Measure cyclothem."

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