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

Etty PURNAMAWATY; Tsuyoshi AMIMOTO; Hisanori IMURA; Yoshiharu USUI; Kousaburo OHASHI

doi:10.2116/analsci.10.749

Etty PURNAMAWATY, Tsuyoshi AMIMOTO, Hisanori IMURA, Yoshiharu USUI, Kousaburo OHASHI

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Keywords: Extraction, molybdenum(VI), alkylated 8-quinolinol derivatives, substituent effect, extraction constant

JOURNAL FREE ACCESS

1994 Volume 10 Issue 5 Pages 749-753

DOI https://doi.org/10.2116/analsci.10.749

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Published: October 10, 1994 Received: May 23, 1994 Available on J-STAGE: July 04, 2006 Accepted: June 15, 1994 Advance online publication: - Revised: -
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Date of correction: July 04, 2006 Reason for correction: - Correction: ABSTRACT Details: Wrong : 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 K_ex(=[MoO₂(Q)₂]_org/MoO₄^2-][H⁺]²[HQ]²_org), 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).
Right : 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 K_ex(=[MoO₂(Q)₂]_org/[MoO₄^2-][H⁺]²[HQ]²_org), 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).

Date of correction: July 04, 2006 Reason for correction: - Correction: PDF FILE Details: -

Abstract

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 K_ex(=[MoO₂(Q)₂]_org/[MoO₄^2-][H⁺]²[HQ]²_org), 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).

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