title: Fast simultaneous determination of traces of Cu(II) and Co(II) in soils and sediments with the luminol/perborate chemiluminescent system.
abstract: A flow injection analysis method based on ion chromatography and luminol chemiluminescence detection was used for the simultaneous determination of copper (II) and cobalt (II) trace levels in soils and sediments following microwave-assisted acid digestion. Detection was based on chemiluminescence (CL) of the luminol-perborate system in an alkaline medium, which is catalyzed by both transition metals. The concentration and pH of the eluent (oxalic acid) was found to affect CL intensities and retention times, both of which were inversely proportional to the oxalic acid concentration. The calibration curves for both metal ions were linear and allowed a limit of detection of 0.003 μg l(-1) for cobalt (II) and 0.014 μg l(-1) for cooper (II) to be calculated. The proposed method was successfully used to determine both metal ions in certified reference materials of stream and river sediments and soil samples. Based on the results, the determination is free of interferences from the usual concomitant ions.
authors.affiliation: Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, 13071 Ciudad Real, Spain. joseantonio.murillo@uclm.es
authors.forename: José A Murillo
authors.initials: JA
authors.lastname: Pulgarín
authors.forename: Luisa F García
authors.initials: LF
authors.lastname: Bermejo
authors.forename: Armando Carrasquero
authors.initials: AC
authors.lastname: Durán
mesh_terms: D001881:Borates / Q000737:chemistry; D002413:Cations, Divalent / Q000032:analysis; D003035:Cobalt / Q000032:analysis*; D003300:Copper / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D017022:Flow Injection Analysis / Q000379:methods; D019015:Geologic Sediments / Q000737:chemistry; D049449:Luminescence; D008163:Luminescent Measurements; D008165:Luminol / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D001881:Borates; D002413:Cations, Divalent; D012987:Soil; D012989:Soil Pollutants; D003035:Cobalt; D008165:Luminol; D003300:Copper