Abstract:

This paper describes the preparation of a graphite electrode coated with membrane containing the dibutyl phthalate (or dioctyl phtalate) as the plasticizer and poly (vinyl chloride) as the polymer matrix.The test has shown this coated membrane graphite electrode can be used as a indicator electrode in potentionmetry titration.lt is accurate, precise and sharp end-point jump when titrate drugs with sodium tetraphenbor. This method is more simple and convenient and rapid than the pharmacopoeia method.