Monitoramento de glifosato no Complexo Estuarino Lagunar Mundaú-Manguaba (CELMM) por cromatografia de íons com supressão química e detector de condutividade

• Autor(a) principal: Novais, José Fábio Felix de
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional do Instituto Federal de Alagoas (RI IFAL)
• Texto Completo: https://repositorio.ifal.edu.br/handle/123456789/732
• topic: Cromatografia de íons; Glifosato; Lagunas Mundaú-Manguaba; Riachos; Problemas Ambientais; Ion chromatography; Glyphosate;; Mundaú-Manguaba Lagoons; Streams; Environmental Problems; CIENCIAS EXATAS E DA TERRA::QUIMICA

The Estuarine Complex Lagunar Mundaú-Manguaba - CELMM has relevant cultural, gastronomic, social, economic and environmental importance for the cities that surround it. The main economic activity developed that encompasses its surroundings comes from the sugarcane agroindustry, responsible for the use of tons of pesticides every year in the monoculture of sugarcane. In the last 4 decades, the tributaries of the CELMM have been receiving inorganic contaminants (nutrients from fertilizers) from the sugarcane industry and agribusiness, through leaching caused by the hydrological cycle, feeding streams, rivers and channels that flow into its bed, acting as a vehicle transporter by agricultural flow of ions, with a tendency to modify the physical, chemical and biological characteristics of its ecosystem. However, for this reason, there is a need for detailed studies focusing on the determination of pesticides in the CELMM basin region. In this sense, among the various types of pesticides sold in Brazil, those products with a broad spectrum of action, the so-called non-selective, systemic and post-emergent, such as the herbicide glyphosate N-(phosphonomethyl) glycine, stand out. In this perspective, 8 samples were collected at 8 points of surface water up to 20 cm deep in the streams and channels of the agricultural region that flow into 4 municipalities that make up the CELMM, being collected in the period of the sugarcane harvest to determine the following ions of interest for public health by ion chromatography, such as glyphosate and other anions (fluoride, chloride, nitrite, bromide, nitrate, sulfate and phosphate) and cations (lithium, sodium, potassium, ammonium, magnesium, calcium). The municipalities in the state of Alagoas monitored were: Maceió/AL, Marechal Deodoro/AL, Pilar and Santa Luzia do Norte/AL. The analytical results did not show glyphosate concentrations above the limits of quantification (LQ) determined in the calibration curves of the monitored ions, which are (0.05 mg L-1), whereas other anions and cations that were quantified have concentrations below the Maximum Permissible Value (MPV) in accordance with current Brazilian legislation.