METHODS Promethazine hydrochloride formed PMH-TPB collosol quantitatively with sodium tetraphenylboron in an acidic medium.

• 方法用四苯硼钠标准溶液滴定盐酸异丙嗪溶液，采用0.；5%25聚乙烯吡咯烷酮溶液作为胶体保护剂。