Dependence of lanthanide-ion binding performance on HDEHP concentration in HDEHP impregnation to porous sheet

Ishihara, Ryo*; Asai, Shiho; Otosaka, Shigeyoshi  ; Yamada, Shinsuke*; Hirota, Hideyuki*; Miyoshi, Kazuyoshi*; Umeno, Daisuke*; Saito, Kyoichi*

Permeative flow through pores of porous membranes enhances the mass transfer of target ions. When polymer chains containing functional groups are appended to the pore surface of porous membranes, a high-speed collection of target ions is achieved. In this study, an octadecylamino-group-introduced polymer chain grafted onto a porous sheet was impregnated with bis(2-ethylhexyl)phosphate (HDEHP). The porous sheet into which a CHNH group was introduced was immersed in HDEHP/ethanol solution. The liquid permeability of a cartridge charged with the HDEHP-impregnated porous sheet in disk form was 96% that of the starting-porous-disk-packed cartridge. The equilibrium binding capacity was 0.32 mol per kg of the disk. The HDEHP-impregnated porous sheet was found to be applicable to the preconcentration of trace amounts of lanthanides prior to their measurement by ICP-MS.