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- W2380160897 abstract "The paper chromatographic behaviour of uranium, lanthanum, samarium, europium, gadolinium and yttrium with tri-n-octylamine (TNOA)/ammonium nitrate system and the ascending technique was investigated. The Whatman No. 1 paper strip (1.5×21 cm) was treated with 0.3 ml of 0.2 M TNOA benzene solution, which had been saturated with twice its volume of 2 M nitric acid before use. As eluent, aqueous ammonium nitrate solution of different concentrations, acidified with nitric acid, was used. It took about two hours to develop the chromatogram, The relation between the R_F values of the elements mentioned and the concentration of ammonium nitrate (2-10 M, acidified with nitric acid to attain pH 2.4) was shown in Table 1 in the Chinese text. It was found that uranium(Ⅵ), lanthanum and samarium together with europium, gadolinium, and yttrium can be separated into three spots over a wide range of ammonium nitrate concentrations. Changing the acidity of the eluent from 0.002 M to 1 M nitric acid, increases the RF values of lanthanum and uranium(Ⅵ) noticeably, while those of samarium, europium, gadolinium, and yttrium very slightly (0.2 unit in R_F) (cf. Table 1 in the Chinese text). The acidity for saturating tertiary amines also exerted an influence. With eluents saturated with less than 0.5 M nitric acid, the spots of rare earth dements became elongated and even showed tailing. Therefore, 1-2 M nitric acid was recommended for saturating the tertiary amine solutions. With six tertiary amines (n-butyl to n-nonyl amines in benzene, saturated previously with 1 M nitric acid) as stationary phase, no relationship can be found between the number of carbon atoms in the amines and the R_F values of the dements studied (cf. Table 3 in the Chinese text). With tri-n-butylamine and tri-n-nonylamine, lanthanum cannot be separated from the rare earth elements studied, while with the other tertiary amines, this can be done. Uranium(Ⅵ) can be separated from rare earth elements with all of the six amines mentioned. A procedure was devised for isolation and detection of 1μg of samarium, europium, or gadolinium from 1 mg of lanthanum. This procedure may be applied to the analysis of traces of rare earths with lanthanum as carrier. The rare earth spot can be cut off and then determined spectrophotometrically after suitable treatment." @default.
- W2380160897 created "2016-06-24" @default.
- W2380160897 creator A5043977858 @default.
- W2380160897 date "1964-01-01" @default.
- W2380160897 modified "2023-09-25" @default.
- W2380160897 title "ON THE SEPARATION OF RARE EARTH ELEMENTS BY MEANS OF REVERSED-PHASE PAPER CHROMATOGRAPHY III. THE TNOA-AMMONIUM NITRATE SYSTEM" @default.
- W2380160897 hasPublicationYear "1964" @default.
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