Abstract
The present work evaluated the ecological risk of glyphosate by its commercial formulation (Roundup Original®) used to control floating aquatic macrophytes. Exposure analysis and ecological effects were performed from microcosm studies. The risk characterization was performed based on the calculation of the risk quotient. The commercial formulation of glyphosate had high toxicity when it was assessed separately. On the other hand, ecotoxicological evaluation of water samples from microcosms did not present toxicity to any tested organisms, however, glyphosate application is recommended exclusively to water bodies that have the surface completely covered by macrophytes.
Highlights
Ecological risk assessment of pesticides is a legal requirement in Brazil, recommended in the Decree no 4,074/2002 and in specific legislation of Brazilian Institute of Environment and Natural Renewable Resources - IBAMA (Ordinance no 84/1996)
Of glyphosate, Roundup Original®, for the management of floating aquatic macrophytes. It was considered the risk of the commercial formulation of glyphosate, its active ingredient and metabolite aminomethylphosphonic acid (AMPA) through the methodology proposed by IBAMA (2012) in four steps: (i) problem formulation, (ii) exposure analysis, (iii) ecological effects analysis and (iv) risk characterization
According to the label of its commercial formulation, glyphosate is classified as a kind of glycine with substituted chemical group included in the toxicological class III, being considered moderately toxic
Summary
Ecological risk assessment of pesticides is a legal requirement in Brazil, recommended in the Decree no 4,074/2002 and in specific legislation of Brazilian Institute of Environment and Natural Renewable Resources - IBAMA (Ordinance no 84/1996). In this sense, some routines and procedures must be developed, data and information must be organized, evaluated, tested and all the uncertainties related to the pesticides behavior in the environment minimized, as well as their possible ecological effects in order to simplify, facilitate decision-making and to ensure a systematic implementation of legislation (IBAMA 2012). Risk quantification is performed in comparing the acute effect with the estimated environmental concentration that can be calculated by environmental models, mesocosms or field measurements (Inao et al 2008)
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