METHOD FOR PREPARING A SOLUTION OF A RARE EARTH ORGANOPHOSPHATE

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The invention relates to a method for preparing a solution of a rare earth organophosphate in an organic solvent. The method is characterised in that it includes a first step that comprises reacting, with an organophosphated acid, a rare-earth compound selected from the rare-earth oxides, hydroxides, acetates, carboxylates, carbonates and bicarbonates in the absence of said organic solvent or in the presence of the solvent in an amount not exceeding 50 % of the final amount if the solvent in the solution; and a second step that comprises adding the remaining quantity of the solvent to the product of the reaction of the preceding step.