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- W2054454380 abstract "The extraction equilibrium relations of neodymium and samarium were studied in the system HCl (1.0 mol dm−3)-di-(2-ethylhexyl) phosphorie acid (HDEHP), for a wide range of neodymium and samarium concentration (0.02-1.20 mol dm−3), mole fraction (Xi=0.005-0.995) and acidity (CH+=0.27-1.06 mol dm−3). A relatively simple, high precision model for the distribution ratio Di was established by correlating the experimental data with a progressive regression program Di=exp(a1+a2I+a3CH++a4Xi)Ia5Xia6 InCH+ + a7 In(1-Xi)The extraction behaviour of the neodymium-samarium binary system was studied using the above model. The study of acid equilibrium shows that the extraction proceeds according to the cation exchange reaction within this range of experimental parameters. The neodymium and samarium concentrations in the organic phase increase rapidly and reach a maximum, and then decrease as the aqueous concentration increases; the maximum concentration appears at about 0.3-0.4 mol dm−3 of aqueous neodymium and samarium concentration. The variation of separation factors, βSm/Nd, was also studied with the change in aqueous acidity, rare earth concentration and mole fraction, βSm/Nd vary between 6.5 and 10.2 and the average value is 8.77." @default.
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- W2054454380 date "1992-01-01" @default.
- W2054454380 modified "2023-09-26" @default.
- W2054454380 title "4983921 Rapid calibration of nutation angles in MRI" @default.
- W2054454380 doi "https://doi.org/10.1016/0730-725x(92)90065-8" @default.
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