Add time:07/16/2019         Source:sciencedirect.com

The complex formation of gallium(III) with 8-hydroxy-7-iodoquinoline-5-sulphonic acid (ferron) (L) was studied by potentiometry; and the dissociation constants of the ligand were redetermined. A new computer program made it possible to make allowance for a considerable number of equilibria. In the pH range 2–10, the main species were as follows (the logarithm of the absolute stability constants at 25.0 ±0.1° for ionic strength 0.1 M are given in parentheses): GaHL (11.3), GaL (14.7), Ga(OH)2L (32.3), GaL2 (23.9), GaOHL2 (31.0) and GaL3 (29.6). For 1:1, 1:2 and 1:3 mixtures of metal with ferron, the mole fractions of the various complexes as a function of pH were calculated; the effect of pH on the conditional constants of the species GaL, GaL2 and GaL3 was also established.

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