The carrier effects of aged polyethylene microplastics regulate the toxicological effects of azoxystrobin on earthworms: Interaction relationship of adsorption-desorption behavior and combined toxicity
Microplastics, an important pollutant in the environment, have carrier effect on pesticides. However, the influence of aging factors in different regions on the modification of microplastics and its impact on the carrier effect of pesticide are still not clear. Meanwhile, the regulatory effect of ca...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2025-01-01
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| Series: | Environmental Chemistry and Ecotoxicology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590182625001055 |
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| Summary: | Microplastics, an important pollutant in the environment, have carrier effect on pesticides. However, the influence of aging factors in different regions on the modification of microplastics and its impact on the carrier effect of pesticide are still not clear. Meanwhile, the regulatory effect of carrier effect on the toxicity of pesticide on earthworms remains to be explored. Therefore, carrier effects of different aged microplastics on a typical pesticide (azoxystrobin) in aqueous solutions, earthworm epidermal mucus, and simulated intestinal fluid were investigated. The effects on the acute toxicity, oxidative damage, tissue structure, and intestinal function of earthworms were revealed. The results showed that the specific surface area and the content of oxygen-containing functional groups of aged microplastics increased. All microplastics could rapidly adsorb and desorb azoxystrobin in three matrices, and the kinetic process conformed to the pseudo-second-order kinetic model. For adsorption behavior, aged microplastics (UVP) in aqueous solutions and earthworm epidermal mucus could adsorb more azoxystrobin. For the desorption behavior, the desorption capacity of aged microplastics in the three matrices was significantly higher than original microplastics, but there was no significant change in the desorption rate. Toxicity assessment showed that the 96 h-LC50 value of AUVP was the lowest. Microplastics adsorbed with azoxystrobin induced oxidative stress in earthworms, damaged the epidermal and intestinal structures, and intestinal digestive and barrier function. The desorption effects of microplastics in the epidermal mucus and intestine were significantly correlated with the toxicity indicators of earthworms. This study provided direct evidence that the carrier effects of microplastics regulated the toxicity of azoxystrobin to earthworms, and offered a new perspective for the environmental risk assessment of microplastics and pesticides. |
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| ISSN: | 2590-1826 |