Abstract :
Cerium (IV) has a catalytic effect on the very slow redox reaction between gallocyanine and bromate in acidic media. The reaction was monitored spectrohotometrically at 525 nm by a fixed time method of 4.0 min from initiation of the reaction. The decrease in absorbance at 525 nm is proportional to the Ce (IV)concentration in the range of 0.005-1.000 and 1,00-1-0.00 Mg.m1-1. The limit of detection is 2.0 ng.ml-1. The relative standard deviation for ten replicate analyses of 0.100Mg.m1-1 is 1.5,. The method is used for the determination of cerium in synthetic and in real samples, with good accuracy. The effect of interfering cations and anions was also studied.
