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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

ixture toxicity prediction of substances from different origin sources in Daphnia magn

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Author(s):
Silva, Ana Rita R. [1] ; Goncalves, Sandra F. [1] ; Pavlaki, Maria D. [1] ; Morgado, Rui G. [1] ; Soares, Amadeu M. V. M. [1] ; Loureiro, Susana [1]
Total Authors: 6
Affiliation:
[1] Univ Aveiro, CESAM Ctr Environm & Marine Studies, Dept Biol, Aveiro - Portugal
Total Affiliations: 1
Document type: Journal article
Source: Chemosphere; v. 292, APR 2022.
Web of Science Citations: 0
Abstract

Due to several anthropogenic activities, water bodies have been heavily impacted by contaminants identified in aquatic ecosystems, including pharmaceuticals, personal care products, agricultural and industrial chemicals. Risk assessment based on chemical mixtures is still default in many monitoring studies, with decisions being based solely on a chemical-by-chemical basis. The present study aimed to improve risk assessment procedures in water bodies by focusing on mixtures of chemical substances of different origins. The goal was to analyze potential interactions occurring at different complexity levels (binary and quaternary mixtures) using standardised toxicity assays. Mixture toxicity effects were assessed using Daphnia magna as the model organism and the compounds sodium fluoride, boric acid, ammonium hydroxide and acetaminophen as general representatives of contaminants in the aquatic ecosystem. The results revealed interactions between the compounds, mainly showing antagonism but also dose level and dose ratio-dependent deviations. Overall antagonism was the dominant deviation pattern, particularly at low doses, though synergism was also detected at higher doses or specific ratios. Synergism at low doses was found for the binary mixture of ammonium hydroxide and acetaminophen, two common pollutants, which denotes an enhanced risk to aquatic ecosystems. Independent Action provided more accurate predictions for the quaternary mixture, whereas Concentration Addition overestimated the toxicity of the mixture. Regarding the environmental risk assessment of water bodies, the interaction between chemicals in a mixture should not be neglected. The complexity of the mixture interactions found in the present study highlights the importance of complementing chemical screenings of water bodies with mixture toxicity data, particularly when considering chemicals of multiple origins whose joint action remains unknown. (AU)

FAPESP's process: 18/07098-0 - Effects of marine pharmaceuticals in zebrafish and ZFL cell line - emphasis
Grantee:Leticia Veras Costa Lotufo
Support Opportunities: Regular Research Grants