Spectrophotometric determination of iron(II) after separation by collection of its ternary complex of 1,10-phenanthroline and tetraphenylborate on microcrystalline naphthalene.

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A new procedure for the spectrophotometric determination of iron(II) after collection of its ternary complex with 1,10-phenanthroline and tetraphenylborate on microcrystalline naphthalene is described. In the presence of tetraphenylborate, the tris(1,10-phenanthroline)iron(II) ion is quantitatively collected on microcrystalline naphthalene as the ion-association complex. The system conforms to Beer's law over the range 3–50 μg of iron in 10 ml of the solvent. The molar absorptivity was 1.2×10<SUP>4</SUP> l mol cm<SUP>−1</SUP> at 514 nm. The effect of various factors, such as wavelength, pH, amounts of reagent and naphthalene, shaking time, and diverse ions, were also studied. The procedure method was satisfactorily applied to the determination of iron in standard aluminium alloy, aluminium, and magnesium metals.
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