摘要
从藻酸双酯钠中水解出硫酸根，用已知过量的钡沉淀硫酸根，于ｐＨ４．３的ＨＡｃ－ＮａＡｃ缓冲溶液中，在一定量聚乙二醇（ＰＥＧ）存在下，用四苯硼钠（Ｎａ－ＴＰＢ）直接滴定剩余的钡，利用示波极谱图上ＴＰＢ切口的出现指示滴定终点．较大量的钙、镁、铝、锰等存在下不干扰测定．用于藻酸双酯钠原料药和片剂的测定，均获得满意结果，此法终点敏锐。
The SO 2- 4 is hydrolysated from poly saccharide sulphate (PSS) and precipitated by excess of Ba 2+ .In the NaAc-HAc(pH4.3) buffer solution with a right amount of polyethylene glycol the Ba 2+ is directly titrated with Na-TPB.The appearance of the incision of TPB is used to indicate the end point of titration.A large amount of Ca 2+ ,Mg 2+ ,Al 3+ ,Mn 2+ does not interfere the determination .This method is used for determination of PSS in raw samples and tablets,and the results are satisfied. This method is simple and the end piont of titration is sensitive.
出处
《辽宁师范大学学报（自然科学版）》
CAS
1996年第3期240-243,共4页
Journal of Liaoning Normal University:Natural Science Edition
关键词
藻酸双酯钠
示波极谱滴定
滴定终点
心血管药物
poly saccharide sulphate, oscillopolarographic titration, ternary complex
