Risco ecológico e contaminação por pesticidas organoclorados em sedimentos do lago do parque Boa Vista, Francisco Beltrão – PR

Abstract

The intensive use of pesticides in agricultural and urban activities has resulted in the contamination of water bodies, raising concerns regarding environmental health and ecotoxicological risks. Among these compounds, organochlorine and organophosphate pesticides exhibit high potential for bioaccumulation, persistence, and toxicity to aquatic organisms. This study aimed to determine the concentrations of organochlorine and organophosphate pesticides in sediments from a lake located in Boa Vista Park, in the urban area of Francisco Beltrão, Paraná, Brazil. Sediment samples were collected at three distinct points in triplicate and analyzed using gas chromatography coupled with tandem mass spectrometry (GC-MS/MS). Two extraction cycles were performed for all target compounds, and the method was calibrated using analytical curves for Aldrin, Dieldrin, 2,4-DDT, and 4,4-DDT. Glyphosate was not detected in any sample, even after repeated analyses, suggesting possible methodological limitations. Organochlorine pesticides were detected in all samples, indicating the persistence of these compounds in the environment. The absence of glyphosate may be related to its high solubility in water and low affinity for sediment particles. Ecological risk assessment indicated potential adverse effects on benthic organisms associated with organochlorine contamination. The findings demonstrate significant contamination of the studied lake by organochlorine pesticides and highlight the need for more sensitive analytical methods for glyphosate detection in sediment matrices.