喀麦隆西南地区瓦巴纳农业土壤中微量金属的来源分析、生态和毒理学风险评估

Journal of trace elements and minerals Pub Date : 2025-02-09 DOI:10.1016/j.jtemin.2025.100218

Guedjeo Christian Suh , Ngambu Aloysius Afahnwie , Anicet Feudjio Tiabou , Kouankap Nono Gus Djibril , Adze Rene Meniemoh , Lemnyuy Prosper Yiika

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引用次数: 0

摘要

本研究旨在评估喀麦隆瓦巴纳农业土壤中微量金属的来源、生态影响和生态毒理学风险，使用单一和累积污染指标以及缓解策略。方法采用电感耦合等离子体发射光谱法对土壤样品进行分析。结果与讨论农业土壤样品中Al2O3和Fe2O3含量较高，对微量金属具有较高的吸附能力，是微量金属迁移和富集的重要载体。结果显示，Co、Cu、Cr、Ni、Hg、Mn、La、Sn和Zn均高于地球化学阈值，且物源混合。污染评价指标：污染因子（CF: 1 ~ 6）、污染负荷指数（PLI: 0.02 ~ 1.23）和富集因子（EF: 0.21 ~ 604.80）提示土壤污染和金属污染。潜在生态风险指标显示，微量金属对土壤生态系统的生态效应最小。毒性风险指数（TRI: 0.36 ~ 7.60）和毒性单位分析（TUs: 0.004 ~ 0.96）显示为低毒性，表明微量金属对土壤生态系统的毒理学效应较低。根据Pearson相关矩阵和主成分分析，Co、Cr、Cu、Ni、Zn、V来源于地源，As、Cd、Pb、Hg、Mn来源于地源和人为输入源。结论成岩作用和人为活动对土壤生态系统的污染和金属污染有一定的促进作用。建议必须采取具体的监测和缓解措施（低金属品种、生物炭等），以减少从点源和非点源进入农业土壤的微量金属积累。这项研究是对竹木山附近土壤中潜在土壤污染和金属毒性的基线研究。

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Source apportionment, ecological and toxicological risk assessment of trace metals in agricultural soils of Wabane, South West Region, Cameroon

Background

This study seeks to evaluate the origins, ecological implications, and ecotoxicological risks of trace metals using single and cumulative pollution indicators as well as mitigation strategies in the agricultural soils of Wabane, Cameroon.

Methods

The soil samples were analyzed by ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry).

Results and Discussion

The agricultural soil samples exhibit high levels of Al₂O₃ and Fe₂O₃, which have high adsorption capacity for trace metals and are important carriers of trace metal migration and enrichment. The results highlight significant concentrations of Co, Cu, Cr, Ni, Hg, Mn, La, Sn and Zn above the geochemical threshold values, sourced from mixed provenance. Contamination assessment indicators: contamination factor (CF: 1–6), pollution load index (PLI: 0.02–1.23), and enrichment factor (EF: 0.21–604.80) suggest soil contamination and metallic pollution. The potential ecological risk indicators show minimal ecological effect of trace metals on the soil ecosystem. Toxic risk index (TRI: 0.36–7.60) and toxicity unit analysis (TUs: 0.004 to 0.96) indicates low toxicity, suggesting low toxicological effects of trace metals on the soil ecosystem. According to Pearson correlation matrix and principal component analysis, while Co, Cr, Cu, Ni, Zn and V were obtained from geogenic provenance, As, Cd, Pb, Hg and Mn originate from geogenic as well as anthropogenic input sources.

Conclusion

Lithogenic processes and anthropogenic practices contribute to contamination and metallic pollution of the soil ecosystem.

Recommendations

Concrete monitoring and mitigation measures (low metal cultivars, biochar, etc.) must be taken to reduce trace metal accumulation from point and non-point sources entering agricultural soils. This research acts as a baseline study to potential soil contamination and metal toxicity in soils within the vicinity of Mount Bamboutos.

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来源期刊

Journal of trace elements and minerals Medicine and Dentistry (General), Analytical Chemistry, Environmental Science (General), Toxicology, Biochemistry, Genetics and Molecular Biology (General), Nutrition, Veterinary Science and Veterinary Medicine (General)

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审稿时长

65 days