Comparative deterministic and probabilistic approaches for assessing the aquatic ecological risk of pesticides in a mixed land use basin: A case study in Uruguay.

Autor: Rodríguez-Bolaña C; Departamento de Ecología y Gestión Ambiental, Centro Universitario Regional del Este (CURE), Universidad de la República, Tacuarembó entre Saravia y Bvar. Artigas, Maldonado CP 20000, Uruguay. Electronic address: clrodriguez@adinet.com.uy., Pérez-Parada A; Departamento de Desarrollo Tecnológico, Centro Universitario Regional del Este (CURE), Universidad de la República, Ruta 9 y Ruta 15, CP 27000 Rocha, Uruguay; Grupo de Análisis de Compuestos Traza, Cátedra de Farmacognosia y Productos Naturales, Departamento de Química Orgánica, Facultad de Química, Universidad de la República, General Flores 2124, 11800 Montevideo, Uruguay., Niell S; Grupo de Análisis de Compuestos Traza, Departamento de Química del Litoral, Facultad de Química, CENUR Litoral Norte, Universidad de la República, Ruta 3, Km 363, 60000 Paysandú, Uruguay., Heinzen H; Grupo de Análisis de Compuestos Traza, Cátedra de Farmacognosia y Productos Naturales, Departamento de Química Orgánica, Facultad de Química, Universidad de la República, General Flores 2124, 11800 Montevideo, Uruguay., de Mello FT; Departamento de Ecología y Gestión Ambiental, Centro Universitario Regional del Este (CURE), Universidad de la República, Tacuarembó entre Saravia y Bvar. Artigas, Maldonado CP 20000, Uruguay. Electronic address: frantei@fcien.edu.uy.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Feb 01; Vol. 910, pp. 168704. Date of Electronic Publication: 2023 Nov 20.
DOI: 10.1016/j.scitotenv.2023.168704
Abstrakt: Environmental concentrations of 25 pesticides in superficial water were employed to conduct an ecological risk assessment (ERA) in a mixed land-use basin utilized as a drinking water source. A deterministic risk assessment (RQ) was utilized to evaluate the chronic risk to aquatic biota, while a probabilistic risk assessment (PRA) approach was applied to assess the acute and chronic risk in the most sensitive species and at the community level. A high risk was identified for insecticides (pyrethroids, organophosphates and organochlorines). RQs ranged from 4.0e -4 (2,4-D) to 105.3 (ethion) considering median concentrations and from 8.0e -4 (2,4-D) to 230 (p,p'-DDT) considering extreme concentrations. Temporal variation in ΣRQs showed the highest risk during spring and summer months, which is related to the crop calendar and land use in the Laguna del Cisne basin. For PRA, the probability of exceeding the hazardous concentration HC5 (5th percentile) was higher for the most sensitive species in chronic exposure, especially for cypermethrin (38.9 %), permethrin (25.6 %), and chlorpyrifos (16.6 %). In the case of acute exposures, the probability of surpassing HC5 was higher for the entire freshwater biota, with the highest values observed for bifenthrin (28.3 %), cypermethrin (25.5 %), permethrin (11.75 %), and ethion (11.1 %). The advantages and disadvantages of PRA for assessing pesticide ecological risk were compared with the conventional deterministic RQs approach, highlighting that PRA offers improvements over the deterministic risk assessment, especially for organophosphate pesticides. Additionally, PRA provides a more comprehensive evaluation of risk for both short and long-term exposure, has the potential to incorporate others available toxicity data (e.g., LD50, Daily Intake), and utilizes different hazardous concentrations, such as HC5, HC10, and HC50. Our findings emphasize the urgent need to establish a national regulatory framework to evaluate and mitigate pesticide risks in aquatic ecosystems, especially in drinking water source like Laguna del Cisne.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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