A review has been made of the more important aspects of the literature concerning the determination of total sulphur in rubber. Considerable attention has been given to the work of Dekker, partly on account of the inaccessibility of one of-his papers 12 to most rubber chemists,, but in the Main because his papers have been the most comprehensive of recent publications on the subject.
Vulcanised standard samples have been prepared
and calibrated by analysis for total sulphur by the.
Carius method. These have been used to test the accuracy of a new rapid procedure for total sulphur with satisfactory results. The new method involves oxidation by means of nitric and perchloric acids and broriine, followed by volumetric estimation as benzidine sulphate of the sulphuric acid produced.
The more recent of previous publications concerning the estimation of free sulphur in rubber have been discussed. A suggested new procedure for free sulphur has been detailed, the results of some preliminary analyses have been given, and the lines along which further study will be conducted have been indicated.