a device is provided for the sequestration and concentration of polar chemicals from water . the device includes a microporous hydrophilic membrane enclosure formed by a tube or facing membranes . a mixed sequestration media , contained within the enclosure , transforms dissolved polar organic chemicals into non - mobile species . the sequestration media is a triphasic admixture of a hyper - crosslinked polystyrene - divinylbenzene resin , and a carbonaceous sorbent dispersed on a size exclusion styrene - divinylbenzene copolymer .