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<p>The worldwide use of pesticides caused potential ecological risks. Suburban rivers were one of the main areas where pesticides accumulated in China. This study quantitatively detected 48 pesticides belonging to 9 categories from 31 sampling sites in two typical suburban rivers in the Yangtze River Delta of China. The pollution levels and spatiotemporal distribution characteristics of these pesticides were analysed, and their ecological risks were evaluated using the risk entropy method. The results showed that the total concentrations of 48 pesticides were between ND to 1526.85 ng/L, the highest concentration of a single pesticide was methoprene of 531.51 ng/L. Total concentrations were higher in the dry season (mean: 6.42 ng/L, median: 1.45 ng/L) and lower in the wet season (mean: 6.10 ng/L, median: 1.65 ng/L). Pyrethroids and heterocyclics were the dominant pesticides in both seasons. The pesticide application patterns, and environmental factors such as precipitation and temperature directed the distribution of pesticides in the study areas. The ecological risk assessment results indicated that methoprene and cypermethrin were the pesticides with high acute ecological risks (RQ &gt; 1) in the aquatic ecosystem.</p>

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Seasonal Variation and Ecological Risk Assessment of Pesticides in Suburban Rivers: A Case Study in the Yangtze River Delta of China

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Qianwei Hu,
  • Fengwei Liu,
  • Chuantao Huang,
  • Yuan Xue,
  • Yufei Ling,
  • Zhengni Li,
  • Chunli Liu,
  • Cenyan Huang,
  • Hang Xiao

摘要

The worldwide use of pesticides caused potential ecological risks. Suburban rivers were one of the main areas where pesticides accumulated in China. This study quantitatively detected 48 pesticides belonging to 9 categories from 31 sampling sites in two typical suburban rivers in the Yangtze River Delta of China. The pollution levels and spatiotemporal distribution characteristics of these pesticides were analysed, and their ecological risks were evaluated using the risk entropy method. The results showed that the total concentrations of 48 pesticides were between ND to 1526.85 ng/L, the highest concentration of a single pesticide was methoprene of 531.51 ng/L. Total concentrations were higher in the dry season (mean: 6.42 ng/L, median: 1.45 ng/L) and lower in the wet season (mean: 6.10 ng/L, median: 1.65 ng/L). Pyrethroids and heterocyclics were the dominant pesticides in both seasons. The pesticide application patterns, and environmental factors such as precipitation and temperature directed the distribution of pesticides in the study areas. The ecological risk assessment results indicated that methoprene and cypermethrin were the pesticides with high acute ecological risks (RQ > 1) in the aquatic ecosystem.