ISSN 0005-2531 (Print) ISSN 2522-1841 (Online)
COMPLEXATION RARE-EARTH METALS (La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) WITH 3-(2-HYDROXY-3-SULFO-5-NITROPHENYLHYDRAZO)PENTANE-2,4-DIONE AND ITS DETERMINATION IN INDUSTRY WASTE WATER
R.А.Аliyeva, P.Э.Gasanov, S.I.Azimova, F.M.Chyragov, К.Т.Маkhmudov

 

 The investigated complexation of rare-earth metals (REM)  – La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu with 3-(2-hydroxy-3-sulfo-5-nitrophenylhydrazo)pentane-2,4-dione (L) by spectrophotometric, conductometric and potentiometric titration methods. The constant stability of complexes REM with L changes in the following sequence: Lu>Yb>Tm>Er>Ho>Dy>Tb>Gd>Eu>Sm>Nd>Ce>La. It is established that with decrease of ions radius REM  stability constant increases and molar absorption and environment of the REM do not influence on comparison REM:L=1:2. The effect of foreign ions and masking agents on the complexation is studied. A spectrophotometric procedure was developed for determining of REM in industrial waste water

Keywords : complex formation, ions of rare-earth metals, 3-(2-hydroxy-3-sulfo-5-nitrophenylhydra-zo)pentane-2,4-dione, constant stability of complexes
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№4 2021
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