High Quality Content by WIKIPEDIA articles! Zerovalent iron and zero.valent metals (ZVI and ZVM, respectively) have a variety of applications ranging from filters to electrodes to trenches. One of the emerging uses for ZVI is iron wall remediation. This technology uses ZVIs to form a permeable reactive barrier (PRB) which filters out contaminants in groundwater, leaving only decontaminated groundwater and dissolved iron on the other side of the PRB. The small size of the iron particles means that this method of ZVI groundwater remediation also overlaps with the field of nanotechnology.