title: Chelex-100 ion-exchange filter membranes for preconcentration in X-ray fluorescence analysis of water.
mesh_terms: D007474:Ion Exchange; D008567:Membranes, Artificial; D008670:Metals / Q000032:analysis; D013050:Spectrometry, Fluorescence / Q000295:instrumentation*; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014965:X-Rays
chemical_list: D008567:Membranes, Artificial; D008670:Metals; D014873:Water Pollutants; D014874:Water Pollutants, Chemical