Separation of arsenic species by ion exchange resin and mixed metal oxides for determination by ICP-OES

Abstract

A novel method for speciation of arsenic (As(III), As(V) and dimethyl arsenic acid (DMA)) in water using solid phase materials including strong base anion exchange (SBAE) resin and iron-copper binary oxide coupled with inductively coupled plasma optical emission spectrometry (ICP-OES) was developed. This study aims to separate and quantitatively determine water-soluble arsenic (As(III) As(V) and dimethyl arsenic acid (DMA)) towards two steps of solid phase extraction at the same pH. In this work, nanostructured iron-copper binary oxide was prepared by using coprecipitation method. The effect of pH of solution and concentration of eluent on adsorption behavior of As(III), As(V) and DMA were investigated. Results concluded that SBAE resin can adsorb As(V) at pH 11 while As(III) and DMA could not be retained. For iron-copper binary oxide material, DMA could not be retained while As(III) and As(V) could be adsorbed at pH 11. The determination of each arsenic species was achieved by ICP-OES. The maximum adsorption capacities of As(V) on SBAE resin and As(III) on iron-copper binary oxide were 10.6 mg g-1 and 36.8 mg g-1, respectively.