HPLC Procedure for the Determination of Free Sulfur in Natural Rubber Formulations

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Abstract
The conventional ASTM method for the determination of the percent of free sulfur is a time-consuming method. Additionally, because of the many steps involved and the necessity of subjective endpoint determination, the data would vary from operator to operator. This lack of precision is detrimental in a quality-control type environment, and a retest can literally hold up production. The HPLC method described is almost totally automated. Sample preparation involves no exposure to such toxic chemicals as formaldehyde, cadmium salts, or glacial acetic acid. Quantitation is a computer operation negating operator to operator variations which can cause up to 20% relative standard deviation.

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