In pH 2.0-3.0 medium,niobium(v)forms molybdoniobic acid withsodium molybdate.A spectrophotometric method has been developed for thedetermination of niobium based
The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 8-hydroxyquinoline-5-sulphonic acid in the presence of diethylam