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<p>Source apportionment and elucidation of migration pathways of organochlorine pesticides (OCPs) are critical yet unsolved scientific issues for the sustainable development of plateau lakes. Here, we integrated the distribution pattern, source analysis, and bioaccumulation process of OCPs in a typical semi-enclosed plateau lake, a representative aquatic ecosystem of the Tibetan and Yunnan-Guizhou plateau, to address these scientific issues. The δ-hexachlorocyclohexane (δ-HCH), α-hexachlorocyclohexane (α-HCH), and endrin aldehyde were the predominant OCPs in sediments, with concentrations ranging from nd (not detectable) to 459.89&#xa0;ng∙g<sup>−1</sup> (δ-HCH), nd to 450.87&#xa0;ng∙g<sup>−1</sup> (endrin aldehyde), and 11.00 to 236.95&#xa0;ng∙g<sup>−1</sup> (α-HCH), respectively. Notably, the main OCPs in lake sediments were linearly correlated with total organic carbon (TOC), indicating the homologous relationship between OCPs and TOC. Moreover, the behavior of OCPs was governed by the partitioning process regulated by TOC and pH of sediments. By integrating OCP distribution patterns, stable carbon isotope (δ<sup>13</sup>C) mixing model, and geographical features, we identified inflow rivers (87.1%) and farmland (6.3%) as the main sources. Although the bioaccumulation of OCPs in fish was moderate, the long-term health risks of OCPs through fish consumption were non-negligible. The findings of this study highlight the priority of basin-wide source control methods for sustainable management of such semi-enclosed environment.</p>

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Dominant riverine input of legacy organochlorine pesticides to a semi-enclosed plateau lake: distribution, source apportionment, and bioaccumulation

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Xixiang Qiu,
  • Lei Sun,
  • Xiaohui Zhao,
  • Jianhui Liu,
  • Kun Zhang,
  • Yinfeng Zhang

摘要

Source apportionment and elucidation of migration pathways of organochlorine pesticides (OCPs) are critical yet unsolved scientific issues for the sustainable development of plateau lakes. Here, we integrated the distribution pattern, source analysis, and bioaccumulation process of OCPs in a typical semi-enclosed plateau lake, a representative aquatic ecosystem of the Tibetan and Yunnan-Guizhou plateau, to address these scientific issues. The δ-hexachlorocyclohexane (δ-HCH), α-hexachlorocyclohexane (α-HCH), and endrin aldehyde were the predominant OCPs in sediments, with concentrations ranging from nd (not detectable) to 459.89 ng∙g−1 (δ-HCH), nd to 450.87 ng∙g−1 (endrin aldehyde), and 11.00 to 236.95 ng∙g−1 (α-HCH), respectively. Notably, the main OCPs in lake sediments were linearly correlated with total organic carbon (TOC), indicating the homologous relationship between OCPs and TOC. Moreover, the behavior of OCPs was governed by the partitioning process regulated by TOC and pH of sediments. By integrating OCP distribution patterns, stable carbon isotope (δ13C) mixing model, and geographical features, we identified inflow rivers (87.1%) and farmland (6.3%) as the main sources. Although the bioaccumulation of OCPs in fish was moderate, the long-term health risks of OCPs through fish consumption were non-negligible. The findings of this study highlight the priority of basin-wide source control methods for sustainable management of such semi-enclosed environment.