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This report reviews techniques available to model the interaction between natural organic matter (mainly fulvic and humic acids) and protons and metal cations. A concise definition of natural organic matter is given and its properties are outlined. These materials are macromolecules which exhibit a polyelectrolyte character, owing to numerous dissociable functional groups which are attached to their carbon backbone or from integral parts of the structure. The polyelectrolyte character is thought to be responsible for their conformation, hydrogen bonding or bridging by metal cations between sub-units being important mechanisms. Environmental parameters such as pH and ionic strength thus will have profound effects on the conformation of natural organic matter, the properties of which can change from being a flexible polymer to being a rigid gel. Binding mechanisms and binding strength are discussed and an overview of relevant techniques of investigation is given. This work is part of the Commission's Mirage project - Phase 2, research area `Geochemistry of actinides and fission products in natural aquifer systems'.

Additional information

Authors: FALCK W E, British Geological Survey, Nottingham (GB)
Bibliographic Reference: EUR 12531 EN (1989) 76 pp., FS, ECU 7.50
Availability: (2)
Record Number: 199010205 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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