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Adsorption, Mobility, and Microbial Degradation of Glyphosate in the Soil

Published online by Cambridge University Press:  12 June 2017

Paul Sprankle ,
W. F. Meggitt  and
Donald Penner
Paul Sprankle
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
W. F. Meggitt
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
Donald Penner
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
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Abstract

Glyphosate [N-(phosphonomethyl)glycine] was readily bound to kaolinite, illite, and bentonite clay and to charcoal and muck but not to ethyl cellulose. Fe+++ and Al+++-saturated clays and organic matter adsorbed more glyphosate than Na+ or Ca+-saturated clays and organic matter. Glyphosate appears to be bound to the soil through the phosphonic acid moiety as phosphate in the soil competed with 14C-glyphosate for adsorption sites. Glyphosate mobility in the soil was very limited and was affected by pH, phosphate level, and soil type. The 14C-glyphosate was biodegraded in soil to 14CO2 possibly by co-metabolism. Potentiometric titrations of the compound gave pKa values of 2, 2.6, 5.6, and 10.6.

Type
Research Article
Information
Weed Science , Volume 23 , Issue 3 , May 1975 , pp. 229 - 234
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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