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<p>The current study employs a controlled model experiment aimed at evaluating niobium (Nb) ecotoxicity through quantitative analysis of temporal variation in biological indicators within Chernozem. The ecotoxicological effects of Nb contamination in black soil across varying doses (3x, 30x and 300x background concentrations) and exposure durations (10, 30 and 90 days) were investigated. The findings demonstrated that elevated Nb concentrations significantly suppressed radish (<i>Raphanus sativus</i>) seed germination and root elongation, reduced <i>Azotobacter</i> sp. abundance and inhibited key enzymatic activities, including catalase, dehydrogenase and cellulolytic activity. The most pronounced inhibitory effects were observed after 30 days of Nb exposure, with all biological indicators reaching their minimum values. Moreover, an extended exposure period of 90 days facilitated recovery of soil biological properties, suggesting a potential resilience or adaptive response within the soil microbiome. Among the assessed parameters, <i>Azotobacter</i> sp. exhibited the highest sensitivity to Nb contamination, while cellulolytic activity emerged as the most robust and informative biomarker for Nb-induced soil toxicity. A critical threshold value of 59&#xa0;mg/kg Nb was identified beyond which significant ecotoxicological impacts became evident. These findings provided a valuable framework for ecological risk assessment and biomonitoring of Nb-contaminated soils, offering diagnostic indicators for evaluating soil health and further remediation strategies.</p>

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Assessment of niobium ecotoxicity on biological indicators of chernozem

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Natalia Tsepina,
  • Sergey Kolesnikov,
  • Tatiana Minnikova,
  • Alena Timoshenko,
  • Anna Kuzina,
  • Natalia Evstegneeva,
  • Kamil Kazeev,
  • Tatiana Minkina,
  • Sarieh Tarigholizadeh,
  • Nasir Mehmood,
  • Vishnu D. Rajput

摘要

The current study employs a controlled model experiment aimed at evaluating niobium (Nb) ecotoxicity through quantitative analysis of temporal variation in biological indicators within Chernozem. The ecotoxicological effects of Nb contamination in black soil across varying doses (3x, 30x and 300x background concentrations) and exposure durations (10, 30 and 90 days) were investigated. The findings demonstrated that elevated Nb concentrations significantly suppressed radish (Raphanus sativus) seed germination and root elongation, reduced Azotobacter sp. abundance and inhibited key enzymatic activities, including catalase, dehydrogenase and cellulolytic activity. The most pronounced inhibitory effects were observed after 30 days of Nb exposure, with all biological indicators reaching their minimum values. Moreover, an extended exposure period of 90 days facilitated recovery of soil biological properties, suggesting a potential resilience or adaptive response within the soil microbiome. Among the assessed parameters, Azotobacter sp. exhibited the highest sensitivity to Nb contamination, while cellulolytic activity emerged as the most robust and informative biomarker for Nb-induced soil toxicity. A critical threshold value of 59 mg/kg Nb was identified beyond which significant ecotoxicological impacts became evident. These findings provided a valuable framework for ecological risk assessment and biomonitoring of Nb-contaminated soils, offering diagnostic indicators for evaluating soil health and further remediation strategies.