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Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes |
AB-254 Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes
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Zinc, cadmium and lead can be determined in a concentration range from 0.1 to 500 μg/L and copper in a range from 0.5 to 50 μg/L by means of anodic stripping voltammetry, using the mercury-film technique, either with the «Ultra Trace» graphite electrode or the glassy carbon electrode. The method is based on a preelectrolysis of the sample solution, to which a small amount of Hg2+ ions has been added. Together with the mercury the metals are deposited on the surface of the carbon electrode. During the subsequent stripping process (DP mode) they are again removed from the electrode and thus determined. Organic compounds present in the sample interfere with the determination and have to be removed, e.g. by UV irradiation using the 705 UV Digester. Traces of Pt and other platinum group metals lead to hydrogen generation on the electrode surface and thus render the determination of Cd, Pb and Zn impossible. Tl and In may interfere with Cd and Pb. Bi and Sb interfere with the determination of Cu if they are present in 50-fold excess. Both the 6.1204.100 «Ultra Trace» graphite electrode and the 6.1204.110 glassy carbon electrode can be used for this application. The method has been developed for environmental matrices such as drinking or waste water. It is also ideal for samples that contain large amounts of chloride (e.g. sea water). The limit of detection is 0.05 ppb for Zn, Cd, Pb and Cu.
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AB-254 Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes
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AB-254 Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes
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AB-254 Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes
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AB-254 Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes
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AB-254 Determination of zinc, cadmium, lead, and copper by anodic stripping voltammetry using carbon electrodes
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