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United States Department of Agriculture

Agricultural Research Service

Title: Sorption of polyphenolics (tannins) to natural soils

item Schmidt, Michael
item Hagerman, Ann
item Gonzalez, Javier
item Halvorson, Jonathan

Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/30/2010
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The plant secondary metabolites known as tannins (polyphenolics) comprise up to 40% of the dry mass of plant tissue. Tannins have potent bioactivities ranging from protein precipitation to metal binding and radical quenching, and can affect nutrient metal availability, nitrogen availability, and soil carbon loading. Tannins enter soil via litter decomposition, rain throughfall, and root deposition, but little is known about their fate in soils. I have examined sorption kinetics, maximum sorption, and the soils components responsible for sorption using six model polyphenols. Sorption is a function of features of the tannins such as hydrophobicity, which is positively correlated with the amount sorbed to an Ultisol soil. An extraction method was developed to remove bound tannin from soil. We developed a model for predicting the maximum amount of tannin sorbed to a particular soil based on sorption by individual components of the soil such as clay, sand, and soil organic matter.

Last Modified: 10/19/2017
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