On-line electrochemical preconcentration of manganese for graphite furnace atomic absorption spectrometry using a flow-through electrochemical cell |
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Authors: | Ernest Beinrohr Miroslav Rapta Maw-Lin Lee Peter Tschöpel Günther Tölg |
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Institution: | (1) Laboratorium für Reinststoffanalytik, Max-Planck-Institut für Metallforschung, Bunsen-Kirchhoff-Strasse 13, D-4600 Dortmund 1, Federal Republic of Germany;(2) Department of Analytical Chemistry, Slovak Technical University, CS-812 37 Bratislava, Czechoslovakia;(3) Institut für Spektrochemie und angewandte Spektroskopie, Bunsen-Kirchhoff-Strasse 11, D-4600 Dortmund 1, Federal Republic of Germany |
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Abstract: | A flow system incorporating a 2-electrode electrochemical microcell with a working electrode made from crushed reticulated vitreous carbon and a graphite furnace AAS instrument was used for the preconcentration and determination of trace amounts of Mn. The sample, rinsing and elution solutions were pneumatically transported through the system. Mn2+ ions can be quantitatively deposited both anodically and cathodically at a voltage of +1.5 to + 3 V and –2.5 to –4V, respectively applied to the cell. Samples of 0.1 to 1 ml volume were analyzed within 5–10 min. The limits of detection and determination were 8.7 and 29 pg, respectively. The reproducibility was 1.5 to 5%. The electrochemical behaviour of Mn in the flow system was studied by using a 3-electrode flow-through cell coupled on-line to a flame AAS instrument.On leave from Department of Analytical Chemistry, Slovak Technical University, CS-812 37 Bratislava, Czechoslovakia |
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Keywords: | electrochemical preconcentration of Mn flow-through cell GF AAS water analysis |
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