Studies on mobility and degradation pathways of terbuthylazine using lysimeters on a field scale.

Abstract:

: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.

journal_name

J Environ Qual

authors

Guzzella L,Rullo S,Pozzoni F,Giuliano G

doi

10.2134/jeq2003.1089

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

1089-98

issue

3

eissn

0047-2425

issn

1537-2537

journal_volume

32

pub_type

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