Matéria orgânica em quatro tipos de solos brasileiros: composição química e sorção de atrazina Organic matter in four Brazilian soil types: chemical composition and atrazine sorption

Abstract

Soil organic matter is the main sorptive soil compartment for atrazine in soils, followed in a minor scale by the inorganic fraction. In this study, the soil organic matter quality and atrazine sorption were investigated in four different soil types. The pedogenic environment affected the humification and therefore the chemical composition of the organic matter. The organic matter contribution to atrazine sorption was larger (60-83%) than that of the inorganic fraction. The organic matter capacity in retaining the herbicide was favoured by a higher decomposition degree and a smaller carboxylic substitution of the aliphatic chains.

Keywords

• spectroscopy
• isotherms
• inorganic fraction