Aquatic and sediment ecotoxicity data of difenoconazole and its potential environmental risks in ponds bordering rice paddies.

Autor: Sun J; Zhe Jiang Agriculture and Forestry University, College of Advanced Agriculture Science, 666 Wu Su Street, Lin'an, Hangzhou, Zhe Jiang 311300, China., Xiao P; JiYang College of Zhe Jiang Agriculture and Forestry University, 77 Pu Yang road, Zhu Ji, Hang Zhou 311800, China., Yin X; Zhe Jiang Agriculture and Forestry University, College of Advanced Agriculture Science, 666 Wu Su Street, Lin'an, Hangzhou, Zhe Jiang 311300, China. Electronic address: Yinxh@zafu.edu.cn., Zhu G; Zhe Jiang Agriculture and Forestry University, College of Advanced Agriculture Science, 666 Wu Su Street, Lin'an, Hangzhou, Zhe Jiang 311300, China., Brock TCM; Wageningen Environmental Research, Wageningen University and Research, P.O. Box 47, Wageningen 6700 AA, the Netherlands.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2024 Mar 15; Vol. 273, pp. 116135. Date of Electronic Publication: 2024 Feb 24.
DOI: 10.1016/j.ecoenv.2024.116135
Abstrakt: Difenoconazole has a widespread agricultural use to control fungal diseases in crops, including rice. In edge-of-field surface waters the residues of this lipophilic fungicide may be toxic to both pelagic and benthic organisms. To allow an effect assessment we mined the regulatory and open literature for aquatic toxicity data. Since published sediment toxicity data were scarce we conducted 28 d sediment-spiked toxicity test with 8 species of benthic macroinvertebrates. Ecotoxicological threshold levels for effects were assessed by applying the species sensitivity distribution approach. Based on short-term L(E)C 50 's for aquatic organisms from water-only tests an acute Hazardous Concentration to 5% of the species (HC 5 ) of 100 µg difenoconazole/L was obtained, while the HC 5 based on chronic NOEC values was a factor of 104 lower (0.96 µg difenoconazole/L). For benthic macroinvertebrates the chronic HC 5 , based on 28d-L(E)C 10 values, was 0.82 mg difenoconazole/kg dry weight sediment. To allow a risk assessment for water- and sediment-dwelling organisms, exposure concentrations were predicted for the water and sediment compartment of an edge-of-field pond bordering rice paddies treated with difenoconazole using the Chinese Top-Rice modelling approach, the Chinese Nanchang exposure scenario and the Equilibrium Partitioning theory. It appeared that in the vast majority of the 20 climate years simulated, potential risks to aquatic and sediment organisms cannot be excluded. Although the HC 5 values based on laboratory toxicity data provide one line of evidence only, our evaluation suggests population- and community-level effects on these organisms due to chronic risks in particular.
Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Xiao hui Yin reports a relationship with National Natural Science Foundation of China (Grant nos. 32372579, 21007060) that includes: funding grants. Peng fei Xiao reports a relationship with Ji Yang college of Zhejiang Agriculture and Forestry University Science developmental foundation(Grant no.4251700015) that includes: funding grants. Xiao hui Yin reports a relationship with Natural Science Foundation of Zhejiang Province (Grant no. LY14B070014) that includes: funding grants.
(Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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