Abstract
The paper presents a novel method for the separation/enrichment of trace Ni2+ using (NH4)2SO4-dithizone(H2Dz)-cetyl trimethyl ammonium bromide(CTMAB) system.The effects of different parameters on the enrichment yield of Ni2+ have been investigated. The possible enrichment mechanism of Ni2+ was discussed.The results showed that under the optimum conditions,the water-insoluble chelate of Ni(H2Dz)2 which formed by Ni2+ and H2Dz was quantificationally floated onto CTMAB foam phase.In this condition, Cd2+、Zn2+、Mn2+、Fe2+ and Co2+ could not be floated.Therefore, Ni2+ was separated completely from the above metal ions. The proposed method has been successfully applied to the separation/enrichment of Ni2+ in various water samples, and the recoveries were 94.2%～103.8%.
Published Version
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