Abstract
α-Molybdosilicic acid (α) in aqueous solution is extracted by triisooctylamine nitrate (R 3NHNO 3) in dichloro-l,2-ethane (S) according to an equilibrium which involves the dissociation of the extracted species in the organic phase: α aq+4(R 3NHNO 3) s α [α(R 3NH) 3] s -+(R 3NH) s ++4(N0 3 -) aq+ xH + Extraction allows separation of α from the excess of molybdenum necessary for its quantitative formation from silicate and molybdate. The direct spectrophotometric determination of the heteropolyacid in the organic phase is simple and sensitive (ε =28000 1 cm -1 mole -1 at 300 nm).
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