Titration of fluoride with lanthanum chloride applying the biamperometric and the bipotentiometric end-point detection

Abstract

The possibilities of the biamperometric as well as of the bipotentiometric end-point determination in the titration of potassium fluoride with lanthanum chloride using pairs of antimony, bismuth, tin and quinhydrone electrodes (metal phase platinum, palladium and gold) were investigated. In unbuffered fluoride solutions which contained 75 % of ethanol at the titration end-point, an amount of 5.72 mg of KF was determined with an average deviation of <0.8%. The results obtained are compared with those of the potentiometric titration proving a good agreement. © 1976 Springer-Verlag.