Dosages en analyse minérale par extraction a l'aide de cations colorés

2 n C n -1 0 I -I -4 -3 -2 .I 0 I Log (phen), Figure 3. Extraction of zinc with 8quinolinol and 1 ,I 0-phenanthroline in the presence of 0.06M sodium perchlorate a i pW 4.85 u. (8-quinolinol)o = 0.05M b. (8-quinolinol)o = 0.0026M Slope of log D vs. log (phsn)o: a, 1.0; b, 1.2 ment with the observed slopes of 2.5 and 1.8.The addition of phenanthroline to the extraction system Zn(II)-$-quinilinol-CHCls does not result in either the formation of a phenanthroline adduct of Zn(Ox)z, as our experience with pyridines might lead us to expect. Nor does it lead to the transformation to Zn phensf2, 2c104-, which might be expected from the larger value of its conditional stability constant than that of ZnOsz. Rather, as shown in Figures 3 and 4, the addition of phenanthroline results in the formation of a mixed 8-quinolinol-phenanthroline zinc complex, ZnOx phen+, Clod-(slope log D vs. log Ox or log CIO4-should each be 1.0 for this composition). The driving force of the formation of the mixed ligand complex would seem to be the more favorable extraction characteristics of the mixed chelate complex, On the basis of these findings, we are currently investigating the possible occurrence of mixed ligand ccmplexes in a variety of chelate extraction systems. I 2 L o g ( E q u i n 01 i no1 lo Figure 4. Extraction of zinc with 0.0005M 1.1 0-phenanthroline and a varying amount of 8-quinolinol in the presence of 0.06M sodium perchlorate pH = 4.85,(Zn) = 10-6M,slope = 1.0 (7) Yemamoto, Y., Kinuwaki, S., Bull.

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Dosages en analyse minérale par extraction a l'aide de cations colorés

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Formation of mixed ligand complex in extraction of zinc in presence of 8-quinolinol and 1,10-phenanthroline

Formation of mixed ligand complex in extraction of zinc in presence of 8-quinolinol and 1,10-phenanthroline

Ion flotation method for analysis of some cationic and anionic surfactants below critical micelle concentration

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