聚丙烯中存在的微量金属化合物,诸如钛、铁、铝和锑等的氧化物或盐,影响产品的物理、化学性能。生产中必须控制它们的含量以保证质量。前人对于其中钛、铁和铝的测定曾有过报导,但终因干扰因素多,稳定性差,操作繁琐,试剂、设备昂贵等原因,致使方法在实际应用上受到了限制。为此,我们改进了操作,采用常用显色剂和汞阴极分离技术等,使聚丙烯中钛、铁、铝和锑的测定结果准确稳定。聚丙烯中所含的元素多成为它们的无机盐或氧化物。当聚丙烯等有机物被挥发除去后,残留的无机物用过硫酸钾熔融,使它们转化为各自的硫酸盐,溶于酸 Trace metal compounds present in polypropylene, such as oxides or salts of titanium, iron, aluminum and antimony, affect the physical and chemical properties of the product. Production must control their content to ensure quality. Previous reports on the determination of titanium, iron and aluminum among them have been reported. However, due to many factors, such as many interference factors, poor stability, complicated operation, expensive reagents and equipment, the practical application of the method has been limited. For this reason, we have improved the operation, using the common developer and mercury cathode separation technology, etc., to make the measurement results of titanium, iron, aluminum and antimony in polypropylene accurate and stable. Many of the elements contained in polypropylene become their inorganic salts or oxides. When organic substances such as polypropylene are volatilized and removed, the remaining inorganic substances are melted with potassium persulfate to convert them into the respective sulfates, dissolved in acid