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- W185842007 abstract "Using the eluent, ether-acetone-0.82 M NH_4SCN-conc. HC1 (in the volume ratio of 150:150:4:3), the R_F values of scandium and some other elements are found to be:??All the R_F values found are higher than those given by Lauer et al., which may be probably explained by difference in experimental conditions employed. The R_F values of scandium and lanthanum decrease gradually with the time of equilibration of paper strip in atmosphere of the eluent (from 0-4 hours). However, the difference in R_F values of the two elements mentioned keep rather constant. With the eluent, it is possible to separate satisfactorily one part of scandium from 6000 parts of lanthanum into two separate spots, or to detect one part of scandium (spot with tailing) from 10,000 parts of lanthanum (cf. Fig. 1 in Chinese text). The length of lanthanum spot increases with amount of lanthanum present and becomes virtually constant when more than 7 mg is present.The sensitivity of fourteen reagents towards scandium has been found as follows: limit of identification μg of Sc Alizarin, Quinalizarin, Xylenol Orange 0.001 Morin 0.02 Arsenazo Ⅰ, Ⅱ and Ⅲ, Carmine Red, 8-quinolinol,Quercetin, Sulphonazo, and Thorin 0.1 PAN 0.2 Murexide 0.4 The scandium spot can be determined chelatometrically after wet oxidation with mixed acid (equal volumes of conc, hydrochloric, conc, nitric and conc, perchloric acids).The buffered (pH 2.9) test solution is then titrated with 1 × 10~(-4)M EDTA with xylenol orange as indicator. Nine determinations of 1.00 μg of scandium give an average of 1.003±0.021 μg, with a standard deviation of 0.027 μg.Scandium fails to be separated from yttrium and lanthanons on tertiary amines(tributyl to trinonyl) treated paper with 1 M ammonium thiocyanate-0.1 M hydrochloric acid as eluent. With the above technique, zirconium may be separated from uranium(Ⅵ), thorium and rare earth metals (the latter three can not be separated from one another) on tributyl amine treated paper, and zirconium, uranium (Ⅵ)/thorium/rare earth metals may be separated into three spots as indicated on the other tertiary amines(C_5-C_9) treated paper." @default.
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- W185842007 date "1964-01-01" @default.
- W185842007 modified "2023-09-25" @default.
- W185842007 title "THE CHROMATOGRAPHIC SEPARATION, DETECTION AND DETERMINATION OF SCANDIUM" @default.
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