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The influence of aquatic humic substances on the octanol/water partition coefficient (Kow) of pesticides and trace elements at different pH values

  • Session 3: Complex Formation And Interactions With Solids
  • Conference paper
  • First Online:
Humic Substances in the Aquatic and Terrestrial Environment

Part of the book series: Lecture Notes in Earth Sciences ((LNEARTH,volume 33))

Abstract

The influence of pH and aquatic humic substances on the mobility and potential bioavailability of pesticides (MCPA and dazomet) and several trace elements (e.g. Zn) have been examined. The methods used were ultrafiltration (hollow fibers) and liquid/liquid extraction (the octanol/water partition coefficient — Kow). Based on hollow fiber ultrafiltration of humic waters, about 15% of MCPA and 40–70% of 65Zn were associated with high molecular weight components. The estimated relationship between log Kow and pH for MCPA and dazomet shows that the Kow value of MCPA (an ionizable organic compound) is strongly dependent on pH, whereas the neutral compound dazomet has relatively stable Kow values below pH 11. Aquatic humic substances are shown to indirectly influence the Kow value of MCPA by affecting the pH of the water samples, but there are no significant differences between the Kow values of MCPA and dazomet in the humic samples compared to the reference samples at the same pH. No significant amounts of trace elements, from different water samples (where TOC value varied from 6.54 to 230 mg C/l and pH varied from 4.43 to 3.23), were extracted into the octanol phase.

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Authors and Affiliations

  1. Isotope and Electron Microscopy Laboratory, Agric. Univ. of Norway, P.O. Box 26, N-1432, Aas-NLH, Norway

    Gunnhild Riise & Brit Salbu

Authors
  1. Gunnhild Riise
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  2. Brit Salbu
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Bert Allard Hans Borén Anders Grimvall

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© 1991 Springer-Verlag

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Riise, G., Salbu, B. (1991). The influence of aquatic humic substances on the octanol/water partition coefficient (Kow) of pesticides and trace elements at different pH values. In: Allard, B., Borén, H., Grimvall, A. (eds) Humic Substances in the Aquatic and Terrestrial Environment. Lecture Notes in Earth Sciences, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010487

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  • DOI: https://doi.org/10.1007/BFb0010487

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-53702-1

  • Online ISBN: 978-3-540-46985-8

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