用氟离子选择电极法测定氟，具有范围宽，不受浑浊度、色度的影响，且方法简便，操作快速的优点，应用于环境和生物样品中氟含量的测定。本法探讨了用氟离子选择电极法测定牙膏中的游离氟含量。1材料和方法11仪器PHS—4型酸度计：电磁搅抖器；PF－I型氟离子选择电极；232型甘尿 Fluoride ion selective electrode method for the determination of fluorine, with a wide range, from turbidity, color, and the method is simple, fast operation advantages, used in environmental and biological samples of fluorine content determination. This method explores the fluoride ion selective electrode method for the determination of free fluorine in toothpaste. 1 Materials and Methods 11 Instrument PHS-4-type pH meter: magnetic stirrer; PF-I-type fluoride ion selective electrode;