Electroanalytical Determination of ametryn using a Silver amalgam Electrode and a Sorption Study in Soils under Sugarcane Plantation or Native Area
Journal Title: International Journal of Research in Chemistry and Environment (IJRCE) - Year 2012, Vol 2, Issue 4
Abstract
In Brazil, the use of pesticides has been increasing and an important issue that should take care is the environmental risks. To assess the risk of water resources contamination by pesticides in field it is essential to study and understand the interactions between these chemicals and the soil material. The objective of this work was to study sorption of ametryn, a herbicide widely used in Brazil in sugarcane plantations, in two soils of contrasting textures (clay content), under sugarcane production and native forest. Generally it´s used chromatographic techniques for pesticide sorption in soil, but these technique take long time to be done and could be expensive. The use of electroanalytical techniques is one way to solve these problem. An electroanalytical procedure was established and used to measure ametryn in the soil solutions with a solid silver amalgam as working electrode. Sorption coefficients obtained from the measured sorption isotherms for ametryn in four soil samples showed a moderate sorption behavior in the soil influenced principally by pH and organic matter (OM). In some cases, as pH soil higher than ametryn pKa or higher amount of humification OM, can present a considerable potential to be transported to the groundwater (lower Kf) as well as to surface waters (higher Kf). For this reason should use ametryn carefully in environment
Authors and Affiliations
Soares B. , da W. T. L. , Vaz M. P.
Keywords
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