The stability constants of chloro complexes of La 3+ were determined in perchloric acid media by means of a solvent extraction method. Dinonyl napthalene sulfonic acid was used as one extractant, and the lanthanum concentration was measured by an UV-VIS method using xylenol orange at pH 6. The values obtained for β La,Cl I are (1 ( 0.2, 0.76 ( 0.09, and, 0.67 ( 0.15) mol -1 ‚dm 3 for (2, 3, and 4) mol‚dm -3 , respectively. For β La,2Cl they are (0.2 ( 0.1, 0.09 ( 0.02, and 0.1 ( 0.03) mol -2 ‚dm 6 for (2, 3 and 4) mol‚dm -3 , respectively. According to the specific ion interaction theory (SIT), log β La,Cl 0 ) 1.4 ( 0.1 and (LaCl 2+ , ClO 4 -) ) 0.62 ( 0.03.
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