Sorção de atrazina e de mesotriona em latossolos e estimativa do potencial de contaminação

• Main Authors: Rosane Martinazzo, Deborah Pinheiro Dick, Mauro Mozael Hirsch, Simone Benvenuti Leite, Maria do Carmo Ruaro Peralba
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2011-01-01
• Series: Química Nova
• Subjects: isotherm; environmental risk; pesticides
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422011000800015&lng=en&tlng=en

Following application herbicides usually reach the soil and undergo several dissipation processes which determine their effects on target organisms and on the environment. This work aimed to evaluate atrazine and mesotrione sorption in Oxisols and estimate their potential impact on the environment. We observed that atrazine sorption was influenced by soil organic matter content and its hydrophobic character. Clay fraction was the main factor influencing mesotrione sorption followed in a lesser extent by soil organic matter content. In contrast to atrazine, mesotrione retention was favored by the higher carboxylic substitution in the aliphatic chains of soil organic matter. Atrazine and mesotrione were considered compounds that are likely to pose an appreciable risk of causing deleterious effects on the environment.