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<p>Farmland soils within the black soil region of Kangping County, Shenyang City, were selected as the study area. Eighty-nine farmland soil samples were collected and analyzed for OCP residue levels and spatial distribution characteristics. OCPs were detected in 82.02% of the Kangping County soil samples. Total OCP concentrations ranged from non-detectable to 155.58&#xa0;μg/kg and exhibited significant spatial heterogeneity. Elevated concentrations were predominantly observed in the northeastern and northwestern regions. The detected OCPs comprised six compounds: hexachlorobenzene, p,p'-DDE, β-endosulfan, p,p'-DDD, o,p'-DDT, and p,p'-DDT. Among these, p,p'-DDT constituted the highest proportion of total residues at 64.7%. Although the spatial distributions of OCP residues differed between soils supporting grain and vegetable crops, both land-use types exhibited localized high-residue hotspots against an overall background of low residue levels. Carcinogenic risk assessment indicated that the combined average risk for children across all three exposure pathways (oral ingestion, dermal contact, and inhalation) was approximately 2.5 times higher than that for adults. However, the carcinogenic risks posed by soil OCPs to both adults and children in Kangping County were within acceptable limits. Ecological risk assessment revealed that the maximum risk quotient (RQ) for OCPs reached 6.134, substantially exceeding the threshold value of 1 and indicating high risk to invertebrates. Therefore, local authorities should consider implementing integrated management strategies encompassing pollution source control, environmental remediation, and long-term monitoring to mitigate OCP contamination.</p>

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Residues of organochlorine pesticides in farmland soils and health risk assessment in the black soil region of Kangping County

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Tao Zhang,
  • Lianghe Lv,
  • Shuang Cui,
  • Weijun Qi,
  • Xinyue Liu,
  • Jian Chang,
  • Hang Gao

摘要

Farmland soils within the black soil region of Kangping County, Shenyang City, were selected as the study area. Eighty-nine farmland soil samples were collected and analyzed for OCP residue levels and spatial distribution characteristics. OCPs were detected in 82.02% of the Kangping County soil samples. Total OCP concentrations ranged from non-detectable to 155.58 μg/kg and exhibited significant spatial heterogeneity. Elevated concentrations were predominantly observed in the northeastern and northwestern regions. The detected OCPs comprised six compounds: hexachlorobenzene, p,p'-DDE, β-endosulfan, p,p'-DDD, o,p'-DDT, and p,p'-DDT. Among these, p,p'-DDT constituted the highest proportion of total residues at 64.7%. Although the spatial distributions of OCP residues differed between soils supporting grain and vegetable crops, both land-use types exhibited localized high-residue hotspots against an overall background of low residue levels. Carcinogenic risk assessment indicated that the combined average risk for children across all three exposure pathways (oral ingestion, dermal contact, and inhalation) was approximately 2.5 times higher than that for adults. However, the carcinogenic risks posed by soil OCPs to both adults and children in Kangping County were within acceptable limits. Ecological risk assessment revealed that the maximum risk quotient (RQ) for OCPs reached 6.134, substantially exceeding the threshold value of 1 and indicating high risk to invertebrates. Therefore, local authorities should consider implementing integrated management strategies encompassing pollution source control, environmental remediation, and long-term monitoring to mitigate OCP contamination.