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Comprehensive extraction study using $$N$$,$$N$$-dioctyldiglycolamic acid

Shimojo, Kojiro; Nakai, Ayaka*; Okamura, Hiroyuki; Saito, Takumi*; Ohashi, Akira*; Naganawa, Hirochika

We report on the acid dissociation constants ($$K$$$$_{a}$$) of diglycolamic acid-type ligands together with comprehensive data on the extraction performance of $$N$$,$$N$$-dioctyldiglycolamic acid (DODGAA) for 54 metal ions. The p$$K$$$$_{a}$$ of the diglycolamic acid framework was determined to be 3.54 in water by potentiometric titration, indicating that DODGAA is strongly acidic compared with carboxylic acid. DODGAA can quantitatively transfer various metal ions among the 54 metal ions through a proton-exchange reaction, and provides excellent extraction performance and separation ability for rare-earth metal ions, In(III), Fe(III), Hg(II), and Pb(II) among the 54 metal ions.

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Category:Chemistry, Analytical

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