Metal-ion retention properties of water-soluble amphiphilic block copolymer in double emulsion systems (w/o/w) stabilized by non-ionic surfactants

► Amphiphilic polymers in double emulsion systems (DES) were studied by diafiltration. ► Non-controlled transport processes of DESs produce a negligible retention. ► Interaction between PSMA and REGs is strongly controlled by pH. ► Interaction between PSMA and REGs is strongly controlled by metal ions added. ► Negative effect on PSMA retention capacity and flocculation phenomena are produced.