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TECHNICAL REPORTS
Vadose Zone Processes and Chemical Transport

Studies on Mobility and Degradation Pathways of Terbuthylazine Using Lysimeters on a Field Scale

Water Research Institute-CNR, via Reno 1, Roma, Italy

^* Corresponding author (guzzella{at}irsa.rm.cnr.it)

Received for publication April 18, 2002. 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.

Abbreviations: BTC, breakthrough curve • DDA, desethyl-deisopropylatrazine • DDAH, desethyldeisopropyl-atrazine-2-hydroxide • DEAH, desethyl-atrazine-2-hydroxide • DET, desethylterbuthylazine • DETH, deethylterbuthylazine-2-hydroxide • DIA, deisopropylatrazine • DIAH, deisopropylatrazine-2-hydroxide • TER, terbuthylazine • TH, terbuthylazine-2-hydroxide • TP, transformation product

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JEQ 2003 32: 745-750. [Full Text]  

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