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Presence of humic acid in the environment holds promise as a potential mitigating factor for the joint toxicity of polystyrene nanoplastics and herbicide atrazine to Chlorella vulgaris: 96-H acute toxicity

Chemosphere 2024 5 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Marriya Sultan, Marriya Sultan, Marriya Sultan, Mehdi Khoshnamvand, De‐Sheng Pei Mehdi Khoshnamvand, Marriya Sultan, De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei Mehdi Khoshnamvand, De‐Sheng Pei Mehdi Khoshnamvand, De‐Sheng Pei Mehdi Khoshnamvand, Marriya Sultan, Marriya Sultan, De‐Sheng Pei Dongmei You, Dongmei You, De‐Sheng Pei Xingyi Wei, Dongmei You, De‐Sheng Pei Dongmei You, De‐Sheng Pei Marriya Sultan, De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei Yafang Xie, Yafang Xie, Yafang Xie, Mehdi Khoshnamvand, Yafang Xie, Yixiao Feng, Yixiao Feng, Yixiao Feng, Xingyi Wei, Yixiao Feng, De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei Jing Li, Marriya Sultan, Marriya Sultan, De‐Sheng Pei De‐Sheng Pei Xingyi Wei, De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei De‐Sheng Pei Marriya Sultan, Ailing Fu, Jing Li, De‐Sheng Pei De‐Sheng Pei Ailing Fu, De‐Sheng Pei Ailing Fu, Ailing Fu, De‐Sheng Pei De‐Sheng Pei

Summary

Researchers studied how nanoplastics and the herbicide atrazine together affect freshwater algae, and whether humic acid, a natural organic substance found in water, could reduce their combined harm. They found that both the nanoplastics alone and in combination with atrazine damaged algal growth, photosynthesis, and antioxidant defenses. The presence of humic acid significantly reduced these toxic effects, suggesting it may act as a natural buffer against nanoplastic and pesticide pollution in aquatic environments.

Polymers

Increasing amounts of amino-functionalized polystyrene nanoplastics (PS-NH) are entering aquatic ecosystems, raising concerns. Hence, this study investigated 96-h acute toxicity of PS-NH and its combination with the pesticide atrazine (ATZ) in the absence/presence of humic acid (HA) on the microalgae Chlorella vulgaris (C. vulgaris). Results showed that both PS-NH and PS-NH+ATZ reduced algal growth, photosynthetic pigments, protein content, and antioxidant capacity, while increasing enzymatic activities. Gene expression related to oxidative stress was altered in C. vulgaris exposed to these treatments. Morphological and intracellular changes were also observed. The combined toxicity of PS-NH+ATZ demonstrated a synergistic effect, but the addition of environmentally relevant concentration of HA significantly alleviated its toxicity to C. vulgaris, indicating an antagonistic effect due to the emergence of an eco-corona, and entrapment and sedimentation of PS-NH+ATZ particles by HA. This study firstly highlights the role of HA in mitigating the toxicity of PS-NH when combined with other harmful compounds, enhancing our understanding of HA's presence in the environment.

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