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exchangeable ions

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

exchangeable ions Charged ions that are adsorbed on to sites (with a charge opposite to that on the ion) on the surface of the adsorption complex of the soil (mainly clay and humus colloids). Exchangeable ions can replace each other on this surface, and are also available to plants as nutrients. Although cations (e.g. calcium and magnesium) are the most common, exchanging at negatively-charged sites, some complexes (e.g. sulphate and phosphate) do exchange at positively-charged sites. See also CATION-EXCHANGE CAPACITY; and EXCHANGE CAPACITY.

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AILSA ALLABY and MICHAEL ALLABY. "exchangeable ions." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 10 Nov. 2009 <http://www.encyclopedia.com>.

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