JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 67 No 3 (2022): Journal of the Chilean Chemical Society
Short Communications

DYNAMIC OF HERBICIDES IN SOIL AND SOIL MODIFIED WITH CLAY AND /OR HUMUS

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  • Sylvia Violeta Copaja
Sylvia Violeta Copaja
Facultad de Ciencias. Universidad de Chile
Bio
Published September 2, 2022
Keywords
  • soils; Humus; Kaolinite; Atrazine; Trifuralin; Elovich model; sorption constant Kd; Freundlich model, persitance, leaching.
How to Cite
Copaja, S. V. (2022). DYNAMIC OF HERBICIDES IN SOIL AND SOIL MODIFIED WITH CLAY AND /OR HUMUS. Journal of the Chilean Chemical Society, 67(3), 5587-5594. Retrieved from https://www.jcchems.com/index.php/JCCHEMS/article/view/2017

Copyright (c) 2022 SChQ

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Abstract

ABSTRACT

Herbicides are one of the most widely used agrochemical classes around the world. They help farmers to protect their crops against weeds. However, they can move through the soil profile polluting water resources and adversely affect human health. Groundwater is an important source for the production of drinking water in many places of the world and the presence of pesticide residues in groundwater is a serious threat to the health of consumers of drinking water.

In this work, the behavior of two herbicides Atrazine and Trifluralin were study in an agricultural soil: Alhue soil and this soil modified whit clay (Kaolinite) and organic matter (Humus).

The original soil and modified soil samples were characterized by their physicochemical properties: pH, EC, OC and texture. The analytical method was optimized for the quantification of Atrazine and Trifluralin by High Performance Liquid Chromatography (HPLC). The contact time, adsorption/desorption isotherms, persistence of both compounds in the soil samples and modified soil samples with clay and/or organic matter was studied.

      In general, all sorption curves for Trizine and Trifuralin in the modified soil samples were similar with relatively low adsorption for Trifuralin indicating that the soil modifications were not significant. The kinetic of sorption process was described by Elovich model   

     Both herbicides present a low Koc value, however, they present different types of adsorption, being for Atrazine a moderate adsorption and for Trifluralin a weak adsorption, which implies that both herbicides could be distributed in bodies of water as they are not fixed by organic matter. However, it should be noted that Atrazine presents higher Koc values ​​than Trifluralin in all soil samples, which could mean that Atrazine would be less bioavailable than Trifluralin. Values ​​obtained in the Pearson correlation of CO (%) and % of clay are expected since, when observing the results obtained in the Kd parameters for soils modified by both herbicides, they show that the higher the % of the physicochemical parameter, the higher the adsorption of the compound by the soil. The persistence of the pesticides showed that with both the addition of Kaolinite and Humus to the soil increases the half-life time for both herbicides. The results of the GUS index showed that both Atrazine and Trifluralin would be classified as leachable compounds in all soil samples

 

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