Titrimetric microdetermination of samarium and neodymium

Abstract Titrimetric microdetermination of samarium and neodymium has been described with sodium rhodizonate. Trivalent salts of samarium and neodymium form violet colored complexes in the ratio of 1:3. The complex is dissolved in dilute acid and the rhodizonic acid that is attached with the metal ion is estimated by titrating against a standard solution of ceric sulfate using N -phenyl anthranilic acid as indicator. Interference of cations has been observed.