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Relevance of adjuvants and additives of pesticide commercial formulation on the removal performance of glyphosate by electrochemically driven processes

2018; Elsevier BV; Volume: 212; Linguagem: Inglês

10.1016/j.jclepro.2018.12.007

1879-1786

Nayara Silva Lima, Éverton Marinheiro Souza, Nádia Hortense Torres, Rosângela Bergamasco, Maria Nogueira Marques, Sergi García-Segura, Odélsia Leonor Sanchez de Alsina, Eliane Bezerra Cavalcanti,

Pharmaceutical and Antibiotic Environmental Impacts

Glyphosate is a broad-spectrum systemic herbicide widely used in crops. Contamination of groundwater and superficial water sources by glyphosate may suppose an environmental risk due to its chronic toxicity. In this frame, development of water treatment technologies to remove glyphosate is of high relevance. The objective of this work was to evaluate capabilities of electrochemical oxidation (ECO) as emergent environmental friendly technology. The effect of variation of current density (j), pH and initial concentration of supporting electrolyte was studied when employing DSA® expanded anodes of Ti/Ru0.36Ti0.64O2. Special attention was given to the influence of pH due to the characteristic speciation of glyphosate that may influence ECO performance. Almost complete mineralization (>90%) of pure glyphosate was attained after 3 h of ECO treatment with 0.15 M NaCl at 40 mA cm−2 and pH 3.0. Meanwhile, solely 60% of mineralization was achieved under identical conditions when treating commercial glyphosate pesticide products. Degradation by-products and yielded ionic species were identified by chromatography and chromatography mass spectrometry. A reaction sequence for glyphosate ECO mineralization was proposed.