Binding of a herbicide to water-soluble soil humic substances

Helmut Deschauer, Ingrid Kögel-Knabner

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Dissolved organic matter (DOM) can act as a sorbent for organic chemicals in soils and natural waters. Therefore, distribution of an environmental chemical in soil is determined by a three compartment system of bulk soil matrix, water, and colloidal or dissolved organic matter. In the present study we demonstrate the binding of a new herbicide to DOM. Ultrafiltration techniques allowed the separation of two dissolved fractions of the free herbicide and the herbicide bound to DOM. Ion composition and pH exert a decisive influence on the sorption processes. An effective sorption isotherm is calculated, which takes into account the sorption onto DOM. Implications of the results on the movement of the herbicide in soils are discussed.

Original languageEnglish
Pages (from-to)393-401
Number of pages9
JournalScience of the Total Environment
Volume117-118
Issue numberC
DOIs
StatePublished - 30 May 1992
Externally publishedYes

Keywords

  • binding
  • dissolved organic matter
  • herbicide
  • ion composition and pH
  • ultrafiltration
  • water-soluble soil humic substance

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