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The title system has been studied elaborately. 3% (v/v) octan-1-ol is added as de-emulsifier. Equilibration time is < 2 min. Distribution ratio (D) at constant pH (eq) and [H 2 A 2 ] is independent of [Ni(II)] (aq) . The pH dependency is always found to be 2; whilst the extractant dependence is found to vary from 1 (at lower concentration region, lcr) to 3 (at high concentration region, hcr). Moreover, the distribution ratio is found to be inversely proportional to (1+6.92 [SO 4 2-]) and [Acdoi:10.3329/jsr.v4i1.8007 fatcat:7w2a6ca2wndxpmuwd7l7pqepzm