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<p>Chlorpyrifos (CPF) and dimethoate (DMT) are representative organophosphorus pesticides (OPPs) that are frequently detected in aquatic environments. There are only a few studies on the unique advantages of microalgae in pesticide treatment, particularly in relation to their ability to remove OPPs and the pathways involved in their degradation. The present study demonstrated the removal potential of <i>Chlorella vulgaris</i>, <i>Chlamydomonas</i> sp., and <i>Tetradesmus obliquus</i> for the two pesticides. The results showed that CPF (0.1 and 1&#xa0;mg L<sup>−1</sup>) inhibited the growth of the microalgae, while DMT promoted growth, with both chemicals inducing oxidative stress on microalgal cells. The removal of CPF and DMT by the three microalgae species (initial cell number of 5 × 10<sup>5</sup> cells mL<sup>−1</sup>) ranged from 47.55 to 50.29% and 54.71 to 60.98%, respectively. Bio-degradation was found to be the main mechanism for the removal of CPF and DMT by microalgae. CPF produced seven bio-degradation products and DMT produced five bio-degradation products. The bio-degradation pathways mainly involved dechlorination, methylation, decarboxylation, demethylation, and ring cleavage. The acute toxicity of CPF and DMT decreased after bio-degradation, but the chronic toxicity of some intermediates still existed. This study provides a theoretical basis for the removal of OPPs by microalgae from aqueous environments.</p>

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Physiological responses and degradation potential of microalgae Chlorella vulgaris, Chlamydomonas sp. and Tetradesmus obliquus to organophosphorus pesticides chlorpyrifos and dimethoate

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Jiaxin Sui,
  • Fang Yang,
  • Zengyun Huang,
  • Ming Li

摘要

Chlorpyrifos (CPF) and dimethoate (DMT) are representative organophosphorus pesticides (OPPs) that are frequently detected in aquatic environments. There are only a few studies on the unique advantages of microalgae in pesticide treatment, particularly in relation to their ability to remove OPPs and the pathways involved in their degradation. The present study demonstrated the removal potential of Chlorella vulgaris, Chlamydomonas sp., and Tetradesmus obliquus for the two pesticides. The results showed that CPF (0.1 and 1 mg L−1) inhibited the growth of the microalgae, while DMT promoted growth, with both chemicals inducing oxidative stress on microalgal cells. The removal of CPF and DMT by the three microalgae species (initial cell number of 5 × 105 cells mL−1) ranged from 47.55 to 50.29% and 54.71 to 60.98%, respectively. Bio-degradation was found to be the main mechanism for the removal of CPF and DMT by microalgae. CPF produced seven bio-degradation products and DMT produced five bio-degradation products. The bio-degradation pathways mainly involved dechlorination, methylation, decarboxylation, demethylation, and ring cleavage. The acute toxicity of CPF and DMT decreased after bio-degradation, but the chronic toxicity of some intermediates still existed. This study provides a theoretical basis for the removal of OPPs by microalgae from aqueous environments.