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<p>This study assessed the ecotoxicological effects of drilling cuttings waste (DCW) generated from offshore oil exploration, focusing on samples derived from both pre-salt and post-salt geological layers. A multi-species approach was employed, including avoidance and reproduction tests with five species of soil invertebrates (<i>Eisenia andrei</i> (Oligochaeta: Lumbricidae), <i>Enchytraeus crypticus</i> (Oligochaeta: Enchytraeidae), <i>Folsomia candida</i>, <i>Proisotoma minuta</i> (Collembola: Isotomidae), and <i>Sinella curviseta</i> (Collembola: Entomobryidae)), and growth and germination tests with two plant species (<i>Lactuca sativa</i> (Asteraceae) and <i>Mimosa scabrella</i> (Fabaceae)). Species-specific sensitivity patterns were identified, with reproduction of <i>P. minuta</i> showing the highest sensitivity to pre-salt DCW (EC50: 0.13%) and <i>S. curviseta</i> the greatest tolerance (EC50: 6.89%). Notably, <i>E. crypticus</i> exhibited higher tolerance to pre-salt than to post-salt residues, indicating that chemical compositional of the residues influence ecotoxicity. In contrast, plant responses showed low susceptibility under short-term exposure. These findings underscore the importance of incorporating ecologically relevant species in ecotoxicity testing to encompass the full range of biological responses and potential risks associated with DCW application in terrestrial ecosystems. Furthermore, the low phytotoxicity under tested conditions supports the feasibility of controlled DCW reuse in land management strategies, such as soil restoration and formulation of organomineral fertilisers. However, long-term monitoring and site-specific evaluations are recommended to mitigate potential cumulative impacts.</p>

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Ecotoxicological effects of drilling cuttings waste from oil wells: sensitivity of soil invertebrates and plants

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Dara C. M. V. P. da Cruz,
  • Higor E. F. Lorin,
  • Fabrielle P. dos Reis,
  • Cibele A. de Costa,
  • Simone B. da Fontoura,
  • Heraldo N. de Souza,
  • Everaldo Zonta,
  • Júlia C. Niemeyer

摘要

This study assessed the ecotoxicological effects of drilling cuttings waste (DCW) generated from offshore oil exploration, focusing on samples derived from both pre-salt and post-salt geological layers. A multi-species approach was employed, including avoidance and reproduction tests with five species of soil invertebrates (Eisenia andrei (Oligochaeta: Lumbricidae), Enchytraeus crypticus (Oligochaeta: Enchytraeidae), Folsomia candida, Proisotoma minuta (Collembola: Isotomidae), and Sinella curviseta (Collembola: Entomobryidae)), and growth and germination tests with two plant species (Lactuca sativa (Asteraceae) and Mimosa scabrella (Fabaceae)). Species-specific sensitivity patterns were identified, with reproduction of P. minuta showing the highest sensitivity to pre-salt DCW (EC50: 0.13%) and S. curviseta the greatest tolerance (EC50: 6.89%). Notably, E. crypticus exhibited higher tolerance to pre-salt than to post-salt residues, indicating that chemical compositional of the residues influence ecotoxicity. In contrast, plant responses showed low susceptibility under short-term exposure. These findings underscore the importance of incorporating ecologically relevant species in ecotoxicity testing to encompass the full range of biological responses and potential risks associated with DCW application in terrestrial ecosystems. Furthermore, the low phytotoxicity under tested conditions supports the feasibility of controlled DCW reuse in land management strategies, such as soil restoration and formulation of organomineral fertilisers. However, long-term monitoring and site-specific evaluations are recommended to mitigate potential cumulative impacts.