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Studies on Mobility and Degradation Pathways of Terbuthylazine Using Lysimeters on a Field Scale
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Studies on Mobility and Degradation Pathways of Terbuthylazine Using Lysimeters on a Field Scale
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Journal Article
Studies on Mobility and Degradation Pathways of Terbuthylazine Using Lysimeters on a Field Scale
2003
Overview
Terbuthylazine [N2‐tert‐butyl‐6‐chloro‐N4‐ethyl‐1,3,5‐triazine‐2,4‐diamine] degradation pathways in agricultural soils were evaluated by following the appearance and mobility of its main transformation products: dealkylated and hydroxylated derivatives. Three experimental degradation studies in open field were performed in different hydraulic conditions: constant hydraulic head on topsoil, achieved to simulate the highest‐risk situation for the aquifer; intermittent artificial precipitation to simulate a medium‐risk situation; and natural precipitation to reproduce the lowest‐risk condition. Concentrations of terbuthylazine transformation products derived from dealkylation and hydroxylation reactions were measured in leachates and soil samples collected during the three experiments. Desethylterbuthylazine (DET) and deethylterbuthylazine‐2‐hydroxide [DETH; 4‐amino‐6‐terbutylamino‐(1,3,5)‐triazine‐2‐OH] were found to be the highest‐leaching compounds and therefore can be considered as potential pollutants for aquifer contamination.
Publisher
American Society of Agronomy, Crop Science Society of America, Soil Science Society,Crop Science Society of America,American Society of Agronomy
Subject
/ Agronomy. Soil science and plant productions
/ Aquifers
/ Biological and medical sciences
/ Biological and physicochemical properties of pollutants. Interaction in the soil
/ Engineering and environment geology. Geothermics
/ Exact sciences and technology
/ Fundamental and applied biological sciences. Psychology
/ Leaching
/ Pollution, environment geology
/ Rain
/ Soil and sediments pollution
/ Soil Pollutants - metabolism
/ Topsoil
