title: Leaching and persistence of ametryn and atrazine in red-yellow latosol.
abstract: This study evaluated the mobility and persistence of atrazine and ametryn in red-yellow latosols using polyvinyl chloride columns with a diameter of 100 mm and a height of 15 cm. The assays simulated 60-mm rainfall events at 10-day intervals for 70 days. The persistence and leaching were evaluated for these two herbicides. The analytes obtained from the samples were quantified by gas chromatography using flame ionization detection. Compared with ametryn, atrazine showed a greater potential to reach depths below 15 cm over 30 days of simulated rain. Ametryn, however, showed greater persistence in soil at 70 days after application. The persistence of atrazine and ametryn in soil under sunlight was 10 and 144 days respectively. Atrazine was more susceptible to sunlight than ametryn because sunlight favored atrazine degradation in hydroxyatrazine. The results indicate that in red-yellow latosol, atrazine has a high leaching potential in short term, but that ametryn is more persistent and has a high leaching potential in long term.
authors.affiliation: a Department of Chemistry , Federal University of Viçosa , Viçosa , Brazil.
authors.forename: Rodrigo T
authors.initials: RT
authors.lastname: de Paula
authors.affiliation: b College of Biological Sciences, Agricultural and Health, University of the State of Mato Grosso , Tangará da Serra , Brazil.
authors.forename: Adley Bergson G
authors.initials: AB
authors.lastname: de Abreu
authors.affiliation: a Department of Chemistry , Federal University of Viçosa , Viçosa , Brazil.
authors.forename: Maria Eliana L R
authors.initials: ME
authors.lastname: de Queiroz
authors.affiliation: a Department of Chemistry , Federal University of Viçosa , Viçosa , Brazil.
authors.forename: Antônio A
authors.initials: AA
authors.lastname: Neves
authors.affiliation: c Department of Plant Science , Federal University of Viçosa , Viçosa , Brazil.
authors.forename: Antônio A
authors.initials: AA
authors.lastname: da Silva
keywords: Herbicide; abiotics factors; degradation; persistence; soil; sunlight