Extraction Equilibrium of Molybdenum(VI) with Several Alkylated 8-Quinolinol Derivatives.

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The extraction equilibria of molybdenum(VI) with several alkylated 8-quinolinol derivatives (HQ): 2-methyl-5-octyloxymethyl-8-quinolinol (HMO8Q), 5-octyloxymethyl-8-quinolinol (HO8Q), and 5-(4-nitrophenylazo)-7-(4-ethyl-1-methyloctyl)-8-quinolinol (HNEQ) have been investigated. Molybdenum(VI) was completely extracted with a 0.01M extractant in chloroform from an aqueous phase at 1M (1M=1mol dm-3) HCl-pH 5 for HMO8Q, 2M HCl-pH 6 for HO8Q and 4M HCl-pH 5 for HNEQ. The extraction constants, log Kex(=[MoO2(Q)2]org/[MoO42-][H+]2[HQ]2org), are 17.72±0.06 (HO8Q-CHCl3), 14.90±0.07 (HMO8Q-CHCl3), 17.00±0.07 (HNEQ-CCl4) and 17.18±0.08 (HO8Q-CCl4) at 25°C. The molybdenum(VI)-HQ complexes, except the HO8Q complex in an organic phase could be easily stripped with an aqueous ammonia solution. Molybdenum(VI) was selectively separated with alkylated 8-quinolinol derivatives from many metal ions, such as iron(III), cobalt(II), nickel(II), copper(II), zinc(II) and gallium(III).

Journal

  • Analytical Sciences

    Analytical Sciences 10 (5), 749-753, 1994

    The Japan Society for Analytical Chemistry

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