caa a22 4500 378877054 CHVBK 20180305123423.0 cr unu---uuuuu 161128e20030201xx s 000 0 eng 10.1524/ract.91.2.97.19990 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.2.97.19990 Synergistic extraction of Th(IV) by 2-hydroxy-1-naphthaldehyde thiosemicarbazone and neutral donors [Elektronische Daten] [S. Banerjee, S. Basu] The extraction behaviour of Th(IV) from aqueous nitric acid medium employing 2-hydroxy-1-naphthaldehyde thiosemicarbazone has been studied in the presence of various donors, like trioctyl phosphine oxide (TOPO), calix[3]OH[3]OMe[6]arene, trioctyl amine (TOA), dimethyl sulphoxide (DMSO) in ethylacetate solvent. The constants (log kex) for the binary complex in organic phase [Th(A)(NO3)3], where A is the ligand, was found to be 3.99, which was by far the largest amongst the corresponding values known for the other thiosemicarbazones. The overall equilibrium constants (log K) for the ternary species [Th(A)TOPO(NO3)3], [Th(A)TOA(NO3)3], [Th(A)Calix[3]OH[3]OMe[6]arene(NO3)3], [Th(A)DMSO(NO3)3] were estimated to be 8.287, 8.862, 8.415, 6.921 respectively. The trend in equilibrium constants were in accordance with the substitution of the donor. The extraction of Th4+ by the ligand-donor combination was maximum at pH=1 and extraction decreases with increase in pH. It has been found that the extent of extraction of Th4+ in the organic phase as the binary as well as ternary complex [Th(A)(NO3)3] and [Th(A)(NO3)3S], where S is the donor, increases with increase in the concentration of the ligand. Similar trend is obtained in the extraction by donors in absence of ligand. In case of ternary extraction, using different donors, amines are found to perform best compared to the other donors. The trend is as follows: TOA > calix[3]OH[3]OMe[6]arene > TOPO > DMSO. In addition, the effect of different diluents on extraction was also studied and the observed trend was methyl salicylate > ethyl acetate > methyl isobutyl ketone > ethyl benzoate. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Banerjee S. aut Basu S. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/2/2003(2003-02-01), 97-104 0033-8230 91:2/2003<97 2003 91 ract https://doi.org/10.1524/ract.91.2.97.19990 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.2.97.19990 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Banerjee S. aut NATIONALLICENCE 700 1- Basu S. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/2/2003(2003-02-01), 97-104 0033-8230 91:2/2003<97 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter