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- W2081325458 abstract "Di(2-ethylhexyl) phosphoric acid+ (D2EHPA or HX) extracts lanthanoids (Ln) from a moderately acidic solution by cation exchange reaction: Ln3++m(HX)nightleftarrowsLnX3·3HX+3H+. From the mode of extraction m is estimated to be 3 in benzene diluent, and smaller than 3 in heptane diluent. The change of the relative extractability with the atomic number of lanthanoids is in line with what is expected from the concept of the tetrad effect proposed by Peppard et al. When the hydrogen ion concentration is very high, the main reaction is solvation: Ln3++3A−+q(HX)nightleftarrowsLnA3·4HX. In benzene diluent q is 2 and n is 2, while q is 1.6–1.7 in heptane diluent. It can be attributed to the difference in the association degree of D2EHPA that m or q is smaller in heptane than in benzene." @default.
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- W2081325458 date "1978-10-01" @default.
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- W2081325458 title "Extraction of Lanthanoids from Hydrochloric and Nitric Acid Solutions by Di(2-ethylhexyl)phosphoric Acid" @default.
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- W2081325458 doi "https://doi.org/10.1246/bcsj.51.2890" @default.
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