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Investigation of the Structure of Neodymium-Di-(2-Ethylhexyl) Phosphoric Acid Combinations Using Electrospray lonization and Matrix-Assisted Laser Desorption Ionization Mass Spectrometry and Nuclear Magnetic Resonance Spectroscopy
Ist Teil von
Metallurgical and materials transactions. B, Process metallurgy and materials processing science, 2005-08, Vol.36 (4), p.429
Ort / Verlag
New York: Springer Nature B.V
Erscheinungsjahr
2005
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Neodymium-di-(2-ethylhexyl) phosphoric acid (DEHPA) species forming in the organic phase during solvent extraction of neodymium with solutions of DEHPA have been studied. Two samples were prepared: one with a low molar ratio of neodymium to DEHPA, which is liquid and clear, and the other with a high molar ratio of neodymium to DEHPA (complete loading), which has the consistency of a gel. Electrospray ionization (ESI) and matrix-assisted laser desorption ionization (MALDI) mass spectrometric investigations show numerous compounds, in addition to the generally assumed species dimeric DEHPA and Nd(DEHP.DEHPA)^sub 3^, in the liquid sample. The nuclear magnetic resonance (NMR) spectroscopic investigation of pure DEHPA and of a completely loaded sample confirm the formula of pure DEHPA and of the organic part of Nd(DEHP)^sub 3^. Furthermore, chemical analysis of a dried, completely loaded sample also proves the existence of the species Nd(DEHP)^sub 3^. Results of X-ray powder diffraction measurements of this sample agree well with literature data. [PUBLICATION ABSTRACT]