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Extraction behavior and selective separation of lead(II) using $$N$$,$$N$$-dioctyldiglycol amic acid

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

Selective separation of lead ions (Pb$$^{2+}$$) from aqueous solutions containing multiple divalent metal ions (Pb$$^{2+}$$, Cu$$^{2+}$$, Cd$$^{2+}$$, Zn$$^{2+}$$, Mn$$^{2+}$$, Co$$^{2+}$$ and Ni$$^{2+}$$) was investigated using liquid-liquid extraction. $$N$$,$$N$$-dioctyldiglycol amic acid (DODGAA) enabled quantitative extraction and efficient separation of Pb$$^{2+}$$ from the metal ion mixture under mildly acidic conditions. Compared with conventional commercial extractants, DODGAA provided better extraction and excellent selectivity for Pb$$^{2+}$$. The extraction of Pb$$^{2+}$$ with DODGAA proceeded through a proton-exchange reaction and formed a 1:2 complex, Pb(DODGAA)2. The Pb$$^{2+}$$ was readily stripped from the extracting phase under acidic conditions, and the organic solution with DODGAA could be recycled.

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Category:Chemistry, Analytical

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