Abstract
Abstract The ion-pair of magnesium(II)–8-hydroxyquinoline-5-sulfonic acid chelate anion with zephiramine (Z+Cl−) was extracted into chloroform. The ternary complex has an absorption maximum at 390 nm in the organic layer. The optimum pH range for the extraction is 10.1–11.4. For the first extract, Beer’s law holds for 4.6–20.6 μg of magnesium(II) in 10-ml organic layer, the molar absorptivity being 6.73×103 cm−1 mol−11. The composition of the ternary complex is estimated to be [Mg2+(QS2−Z+)2(HQS−Z+)]o. The extraction equilibrium is given by Mg^2++3[(HQS^-Z^+)]_o+2OH^-\ightleftharpoons[Mg^2+(QS^2-Z^+)_2(HQS^-Z^+)]_o+2H_2O where QS denotes 8-hydroxyquinoline-5-sulfonic acid and o the organic phase. The equilibrium constant K is given by logK=16.95±0.13.
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