STUDIES ON THE PRECIPITATION OF LANTHANUM AND COBALT OXALATES AND ITSGRAVIMETRIC APPLICATIONS

Precipitation of lanthanum and cobalt as oxalates has been studied ind ividually and in combination Individually lanthanum and cobalt oxalate s exist as deca- and dihydrates respectively, but the combined oxalate is only a hexahydrate. The compositions are also confirmed by thermog ravimetric analysis. Quantitative precipitation of cobalt oxalate is e ffected by decreasing the dielectric constant of the precipitating med ium with acetic acid, Cobalt oxalate can be-precipitated at higher pH by using non-interfering bases such as lutidine for pH adjustments, La nthamum oxalate can be selectively and quantitatively separated from c obalt by complexing the latter with ammonium oxalate, Procedures are s uggested for the simultaneous gravimetric analysis of lanthanum and co balt in presence of each other.