title: Preconcentration of trace metals in environmental and biological samples by cation exchange resin filters for X-ray spectrometry.
mesh_terms: D003031:Coal; D006801:Humans; D009532:Nickel / Q000652:urine; D012623:Seawater / Q000032:analysis; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D014131:Trace Elements / Q000032:analysis*
chemical_list: D003031:Coal; D014131:Trace Elements; D009532:Nickel