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Electrochemical determination of the anionic particle charge of aquatic fulvic acids

Elektrochemische Bestimmung der anionischen Partikelladung aquatischer Fulvinsäuren

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Summary

The fulvic acid (FA) fractions of humic substances from river water and bog lakes and of humic-like substances from landfill leachates were isolated by the XAD-method and titrated by a cationic polyelectrolyte. The isoelectric point of net charge of the FA samples was calculated by the streaming current detection (SCD)-technique and a new parameter of charge density (aPC) was calculated from the titer volume. The aPC-values of the FA are low for humic like substances (0.22–1.76 μeq/mg DOC) and high (2.41–5.60 μeq/mg DOC) for humic substances. Polarographically determined Cu(II)-complexation capacities (CuCC) of humic-like substances are in good linear relationship to their aPC-values. Even though SCD-signals only supply qualitative information, a useful fingerprint of the FA sample is given by the shape of the titration curve.

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Authors and Affiliations

  1. Engler-Bunte-Institute, Karlsruhe University, Richard-Willstätter-Allee 5, D-7500, Karlsruhe 1, Federal Republic of Germany

    Michael Weis & Fritz H. Frimmel

Authors
  1. Michael Weis
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  2. Fritz H. Frimmel
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Dedicated to Prof. Dr. G. Tölg on the occasion of his 60th birthday

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Weis, M., Frimmel, F.H. Electrochemical determination of the anionic particle charge of aquatic fulvic acids. Z. Anal. Chem. 335, 927–930 (1989). https://doi.org/10.1007/BF00466384

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  • DOI: https://doi.org/10.1007/BF00466384

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