Abstract
Abstract A new chelating agent, o-phosphonophenylazo-2-hydroxynaphthalene-3,6-disulfonic acid, has been synthesized. The acid dissociation constants of this ligand and the chelate stability constants with alkaline earth metals have been measured by the pH titration method at an ionic strengh of 0.10 and at 25.0±0.1°C. This ligand forms the acido complex, MHL, in the pH 5–7 region. The stability constants of the acido complex decrease in this order: log KSrHL≈logKCaHL>log KMgHL; whereas the decreasing order of the stability constants, logKML, is as follows: log KMgL>log KCaL>log KSrL.
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