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Journal Articles

Extraction capacity of diglycolamide derivatives for Ca(II), Nd(III) and Zr(IV) from nitric acid to $$n$$-dodecane containing a solvent modifier

Sasaki, Yuji; Zhu, Z.-X.; Sugo, Yumi; Suzuki, Hideya*; Kimura, Takaumi

Analytical Sciences, 21(10), p.1171 - 1175, 2005/10

 Times Cited Count:26 Percentile:60.4(Chemistry, Analytical)

In order to evaluate the extraction property of the new extractants, diglycolamide(DGA) compounds, we investigated the maximum extraction of di-, tri-, and tetravalent metal ions using the system of nitric acid and n-dodecane. Limits of metal concentration (LOC) for Ca(II), Nd(III) and Zr(IV) influence strongly on HNO$$_{3}$$ and the extractant concentration. On the purpose to raise the LOC value, we employed the modifier of solvent, N,N-dihexyl-octanamide(DHOA) and DGA with the long alkyl chain, and examined. It is evident that LOC increases with DHOA concentration in n-dodecane and the length of alkyl chain attached with N atom of DGA. The stoichiometric values of LOC(Zr) estimated from the extraction reaction is obtained by using the extraction condition: tetraoctyl-DGA/ 1M DHOA+n-dodecane and 3M HNO$$_{3}$$.

Journal Articles

Novel compounds, Diglycolamides (DGA), for extraction of various metal ions from nitric acid to n-dodecane

Sasaki, Yuji; Zhu, Z.-X.; Sugo, Yumi; Kimura, Takaumi

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 5 Pages, 2005/10

The extraction of metals by N,N,N',N'-tetraoctyl-diglycolamide (TODGA) from nitric acid to n-dodecane was investigated. From the measurement of distribution ratios, it was obvious that Ca (ionic radius: 100pm), trivalent and tetravalent ions with ionic radii of 87-113 and 83-94 pm are highly extractable by TODGA. In order to evaluate the extraction capacity in extraction solvent using DGA compounds, we measured the limits of metal concentration (LOC) for Ca(II), Nd(III) and Zr(IV). For the purpose to enhance the LOC value, we examined the modifier of solvent, N,N-dihexyl-octanamide(DHOA) and DGA with longer alkyl chain. It is evident that LOC is increased with DHOA concentration and the length of alkyl chain attached to N atom of DGA.

Journal Articles

A method for the determination of extraction capacity and its application to $$N,N,N',N'$$-tetraalkylderivatives of diglycolamide-monoamide/n-dodecane media

Sasaki, Yuji; Sugo, Yumi; Suzuki, Shinichi; Kimura, Takaumi

Analytica Chimica Acta, 543(1-2), p.31 - 37, 2005/07

 Times Cited Count:96 Percentile:93.83(Chemistry, Analytical)

The detailed study of extraction capacity of diglycolamide (DGA) with and without DHOA, N,N'-dihexyloctanamide as a modifier, was performed by using the novel analytical method for the determination of the limit of metal concentration in the organic phase (LOC). The effect on modifier was studied and it is confirmed that LOC increases with DHOA concentration. It is noteworthy that LOC reaches to the stoichiometric value, which is obtained by the extraction reaction, by using 0.1M TODGA mixed with more than 0.5M DHOA into n-dodecane. Without modifier, relation of the different DGA compounds with LOC was investigated, and it is clear that LOC using N,N,N',N'-tetradodecyl-diglycolamide (TDdDGA), whose extractant can suppress the third phase, reaches to the stoichiometric value. From this work, it is obvious that the application of the condition without the third phase formation, e.g., enough concentration of modifier coexisted and DGA with long alkyl chain, is important to attain the stochiometric LOC value.

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