Polarographische Bestimmung von Nickel und Chrom in Klärschlämmen Polarographic Determination of Nickel and Chromium in Sewage Sludge |
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| Authors: | M Kolb J Mann J Schfer F Müller G Bogenschütz C Dengler |
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| Institution: | M. Kolb,J. Mann,J. Schäfer,F. Müller,G. Bogenschütz,C. Dengler |
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| Abstract: | The contents of Ni and Cr in sewage sludge with high and low amounts of heavy metals were investigated by polarography. The DIN-digestion (aqua regia) was used, and the resulting solution was treated with H2O2/UV (90 °C, 60 min) for further destroying of the organic material. Besides, the solution of the DIN-digestion was examined with AAS (flame) and ICP-OES. With the determination of Ni it was shown that after digestion with aqua regia no further treatment with H2O2/UV is necessary. Contrariwise it was found that for the determination of Cr a H2O2/UV photolysis is necessary followed by further steps to get good agreement with AAS and ICP results as well as with the certified values of a sludge of the Community Bureau of Standards. |
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| Keywords: | Klä rschlamm Bestimmung von Ni Cr Polarographische Analyse Photolyse |
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