Evaluating the mobility of polymer-stabilised zero-valent iron nanoparticles and their potential to co-transport contaminants in intact soil cores

•Radiolabelling facilitates the detection of nZVI in systems containing background Fe.•This method enables the spatial distribution of the retained particles to be determined.•Results indicate limited mobility of nZVI, i.e. < 1% of injected mass eluted.•When present in sufficient concentrations, nZVI may promote contaminant transport.