Abstract
The stepwise formation of complexes was demonstrated spectrophotometrically in solutions containing coloured complexes of titanium with chromotropic acid, pyrocatechol, tiron, sulfosalicylic acid, gallic acid and pyrogallolcarboxylic acid in acid medium. In dilute acid solutions of complexes a simple complex TiR is usually formed, in weakly acid buffer solutions a relatively stable complex TiR3 is formed, which, however, up till now has not been demonstrated in the case of sulfosalicylic and pyrogallolcarboxylic acid The stability of the chelates formed is directly related to their absorption spectra and the hydrogen bond stability between the functional groups of the ligand. Formation of a simple stable complex is a necessary condition for the development of an exact photometric method. From this point of view some methods for determination of titanium have been discussed.
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