Enrichment of Arsenic and Its Separation from Other Elements by Liquid-Phase Polymer-Based Retention

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Abstract
Preconcentration and recovery of arsenic from diluted aqueous solutions by soluble polymeric reagents in combination with membrane filtration were investigated. Quaternized poly(ethyleneimine) was found to be an efficient reagent for removal of arsenic and for separation of As(III), As(V), and divalent metal cations such as Cu, Cd, Zn, and Co. Using a 4% solution of the polymer reagnet, 98% of arsenic(V) was retained at pH 8.5, which could be stripped off by addition of a 0.15 M solution of a sodium salt solution at the same pH. A practical application was demonstrated by the removal of more than 95% of As(V) from actual concentrations of arsenic in wastewater.