This experiment aimed to analyze the methodology applied to evaluate the environmental impact caused by the use of herbicide to control macrophytes. The design and construction of the tanks are described in detail as well as the insertion of blades for periphyton and sediment sampling to evaluate the bentonic comunities. The flow-through method was used and several parameters of water quality were measured and residues detected in the water colunm and sediment. The flow-through methodology was chosen to create a situation closer to reality so that the results obtained could more precisely reflect the likely risks caused by chemical control of macrophytes. Some adjustments need to be made in this methodology for a better characterization of the effluents and calibration of the system.
herbicide; periphyton; bentonic community; residues
