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Atrazine Adsorption on Soil as Influenced by Temperature, Moisture Content and Electrolyte Concentration

Published online by Cambridge University Press:  12 June 2017

T. H. Dao  and
T. L. Lavy
T. H. Dao
Affiliation:
Formerly Grad. Res. Asst. Univ. of Nebraska, presently Res. Assoc., Western Washington Res. and Ext. Center, Washington State Univ. Puyallup, WA 98371
T. L. Lavy
Affiliation:
Formerly Prof. Agron., Univ. of Nebraska, presently Prof. Agron., Univ. of Arkansas, Fayetteville, AR, 72701
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Abstract

The adsorption of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] was measured on soil at water:soil ratio of 5:1 and 0.4:1. The adsorption isotherms for atrazine were described by the Freundlich equation. A decrease in water:soil ratio and in soil moisture content led to an increased adsorption of the herbicide. Increasing the concentration of electrolytes in the soil solution by adding solutions up to 0.1M CaCl2 increased atrazine adsorption. Greater amounts of atrazine were adsorbed at 30 than at 5 C on four soils at 0.1 bar moisture content. This indicates an endothermic reaction which was observed both before and after correction for differential atrazine solubility due to temperature. Thermodynamic quantities associated with the adsorption reaction were calculated to characterize the adsorption of atrazine on soil.

Keywords

Freundlich isothermreduced concentration
Type
Research Article
Information
Weed Science , Volume 26 , Issue 3 , May 1978 , pp. 303 - 308
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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