After tretment of paper with a liquid anion exchanger (tri- n-octylamine) the differences in the stability of the metal complexes may be used to improve the analytical separation of some important fission products and actinides by paper chromatography. The R F values of Y, La, Ce, Zr, Ru and Th, Pa, U, Np, Pu, Am with nitric acid and nitrates as eluents are given. Quantitative determination by scanning the radioactive nuclides is possible and some methods are proposed. The oxidation states on Np and Pu are identified by their different R F values. The composition of mixtures with different valency states of the metals may be determined quantitatively.