Dissipation of some citrus selective residual herbicides in an irrigation well.
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AutorGomez de Barreda,D. Jr; Gamon Vila,M.; Lorenzo Rueda,E.; Saez Olmo,A.; Gomez de Barreda,D.; Garcia de la Cuadra,J.; Ten,A.; Peris,C.
The aim of this work was to study the behaviour of some of the main citrus selective residual herbicides in the water of an irrigation well. The chemicals used were: atrazine, simazine, terbuthylazine, terbutryn, terbumeton, bromacil and diuron. The simetric triazines and bromacil were analyzed by gas chromatography and diuron by HPLC. The mentioned pesticides were introduced in the well in order to simulate a point-source contamination. Levels of contamination of the well due to herbicide application were about 1 mg/l, however, dissipation of the herbicides was almost complete 8 days after application, except for bromacil and diuron which persisted longer than the s-triazines.