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Sodium phytate corresponding to a formula of C6H6O24P6Na12 · 3H2O (formula weight 977.8) was titrated against metal ions and in each case an inflection in the titration curve was obtained when 5 moles of a divalent metal ion had been added per mole sodium phytate. At a pH of 7.4, sodium phytate formed complexes with metals in the following decreasing order: Cu++, Zn++, Ni++, Co++, Mn++ Fe+++, and Ca++.
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Gray et al. (1965) studied this question.
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