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A study has been made of certain variables in a methyl borate distillation procedure for the determination of total boron in steel by the curcumin colour reaction. This has led to a procedure that can be used for plain-carbon and alloy steels. A single determination tabes approximately 3 hours, assuming that the initial dissolution of the sample does not take longer than 30 minutes.Results are presented to show the accuracy and precision of the method when appIied to boron contents between 10.002 and 0.100 per cent. in steels of widely different compositions.

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