对矿区土壤质量的监测和评价具有重要意义。在这项研究中,索引,时空,并开发了化学计量模型来监测和评估Iyamitet-Okurumutet矿区内潜在有毒元素(PTE)的污染水平和健康风险,尼日利亚东南部。在矿区内对地表土壤进行采样,并分析pH值,阳离子交换能力,有机物,和PTE(Pb,Zn,Cd,Mn,Fe,Ba)遵循标准技术。结果表明,土壤呈微酸性,除Cd(4.08mg/kg-1)外,PTEs的富集均在推荐标准之内。污染因素,富集因子,污染指数表明土壤受到中度污染。地理空间地图和生态风险指数显示,较高的生态风险印记似乎在该地区的东南部增加。化学计量学分析表明,土壤中PTE的富集主要受人为活动的影响。Further,开发了生物利用度/生物可及性风险评估指数(BRAI)和健康风险评估模型,以量化土壤中元素的生物利用度/人类生物可及性部分以及相关的健康风险。BRAI的范围从高(3≥5)到非常高(>5)的人类生物可及性风险;因此,与植物摄取相比,更大量的PTE生物可吸收到人胃肠系统中。危险指数和终生癌症风险(LCR)表明,大多数样品由于皮肤接触和儿童和成人的摄入而表现出很高的慢性癌症风险。LCR值在1.0E-6和1.0E-04之间,儿童群体显示出更高的癌症风险脆弱性。
Monitoring and assessment of soil quality are important in mining areas. In this study, indexical, spatiotemporal, and chemometric models were developed to monitor and assess the pollution level and health risk of potentially toxic elements (PTEs) within the Iyamitet-Okurumutet mine province, SE Nigeria. Surface soils were sampled within the mine area and analyzed for pH, cation exchange capacity, organic matter, and PTEs (Pb, Zn, Cd, Mn, Fe, Ba) following standard techniques. It was revealed that the soils are slightly acidic and the enrichment of PTEs except for Cd (4.08 mg/kg-1) was within recommended standards. Contamination factor, enrichment factor, and pollution index suggest that the soils are moderately polluted. Geospatial maps and ecological risk indices revealed that higher ecological risk imprints seem to increase towards the south-eastern parts of the area. Chemometric analysis revealed that PTE enrichment in the soil is majorly influenced by anthropogenic activities. Further, bioavailability/bioaccessibility risk assessment index (BRAI) and health risk assessment models were developed to quantify the bioavailable/human bioaccessible portion of elements in soils and the associated health risks. The BRAI ranged from high (3 ≥ 5) to very high (> 5) risk of human bioaccessibility; hence, greater amount of PTEs will be bioaccessible for absorption into the human gastrointestinal system than they would for plants uptake. The hazard index and lifetime cancer risk (LCR) revealed that most of the samples present high chronic cancer risks from dermal contact and ingestion for children and adults. The LCR values ranged between 1.0E-6 and 1.0E - 04, with the children population showing greater vulnerability to cancer risks.