FIELD: analytical methods. SUBSTANCE: terbium is converted into luminescent complex compound with organic reagent, particularly, sulfosalicylic acid S-(4-bromoanilide) methyl ester, in presence of decylpyridinium chloride as surfactant, ratio of terbium/organic reagent/surfactant being 1:2:13 and pH 7.9+/-0.08. Simultaneously, Tb, Dy, Sm, and Eu can be determined in lanthanoid oxides. EFFECT: increased selectivity and reproducibility of determination. 2 cl
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