Adsorção do herbicida glifosato utilizando ácido húmico extraído de três diferentes manejos de solo

Abstract

The use of agrochemicals is an environmental problem, and to reduce this, there are numerous studies on the adsorption capacity of humic substances with agrochemicals. In this work, a test was carried out in fixed-bed columns, calculating the amount of pesticide from that used in reality. Is was assessed the impact on the environment, where the glyphosate solution was sprayed, and in each column, a water solution with humic acids extracted from three different soils (with erosion control, without control and native forest), to determine the adsorption capacity of the herbicide. For native forest HA, the concentrations were varied as 10, 30 and 50 mg L-1 to analyze the effect in relation to adsorption. The results presented data already expected, where the adsorption of the agrochemical is higher with a higher concentration of humic acid, showing a linear behavior. When compared with native forest HA at a concentration of 30 mg L-1 with HA extracted from terracing soil at the same concentration, native HA adsorbed 1,5 mg kg-1 more than terracing HA, and, comparing HA from native forest and HA without terrace at the same concentration, HA from forest adsorbed 1,7 mg kg-1 more, prevailing HA from native forest the most suitable for glyphosate adsorption.