氟离子选择电极是目前应用得最普遍的离子选择电极。但是,样品中铝量过高会使结果偏低,即使加柠檬酸钠,对大量铝仍不能完全掩蔽。文献曾用钛铁试剂代替柠檬酸钠以测定高铝样品中的氟,但钛铁试剂较贵。另外,Kauraner 比较了钛铁试剂和柠檬酸钠掩蔽铝和铁的效果,认为还是柠檬酸钠是比较理想的试剂。 Fluoride ion selective electrode is the most commonly used ion selective electrode. However, the high amount of aluminum in the sample will result in low, even with the addition of sodium citrate can not be completely masked on a large number of aluminum. The literature has used ferrotitanium instead of sodium citrate to determine fluoride in high-alumina samples, but the ferrotitanium reagent is more expensive. In addition, Kauraner compared the effects of ferrotitanium and sodium citrate masking aluminum and iron, suggesting that sodium citrate is an ideal reagent.