墨西哥阿瓜斯卡连特斯矿区污染沉积物和土壤重金属风险综合评价

Q1 Environmental Science
Thanya Crespo-Toledo , Francisco Avelar-González , Alma Guerrero-Barrera , Kerry Mitchell , Laura Yamamoto-Flores , Oscar Flores-Amaro
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引用次数: 0

摘要

采矿活动产生的残余金属对环境和人类健康构成重大风险,特别是当它们以生物可利用和流动形式存在时。在复杂的物理化学特性使得难以估计金属流动性的地区,评估这些风险需要采用综合方法。本案例通过综合以下指标对环境风险进行评估:总金属浓度与参考值之比、地质累积指数(Igeo)、风险表征比(RCR)和迁移系数(MF)。沉积物中Cd、Pb、Cu和Zn的最高浓度分别为45.95、743.01、220.24和2992.84 mg/Kg,土壤中Cd、Pb、Cu和Zn的最高浓度分别为26.23、953、553.46和11948.80 mg/Kg。Igeo确认了中度到重度污染的土壤和沉积物。此外,所有金属的RCR均超过商1,表明存在显著的生态风险。在沉积物和土壤中均观察到Cd的高MF(高达70%)。而Pb、Cu和Zn仅在沉积物中平均为15%。该研究揭示了物理化学特征、pH值、Eh、质地、有机物和CEC影响金属流动性,并以易于获得的形式表明人为金属污染,强调了在评估污染水平和评估污染环境对人类健康和环境的相关风险时,综合物理化学评价和综合使用不同污染指标的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Integrative assessment of heavy metal risks in mining polluted sediments and soils of Aguascalientes, Mexico
Residual metals from mining activities pose significant risks to both the environment and human health, especially when they exist in bioavailable and mobile forms. In areas where complex physicochemical characteristics make it difficult to estimate metal mobility, assessing these risks requires an integrated approach. In this case study environmental risk was assessed by integrating the following indicators: ratio between total metal concentration and reference values, geoaccumulation index (Igeo), risk characterization ratio (RCR) and mobility factor (MF). The highest concentrations of Cd, Pb, Cu and Zn in sediments were 45.95, 743.01, 220.24 and 2992.84 mg/Kg, respectively while the concentrations in soils were 26.23, 953, 553.46, and 11948.80 mg/Kg, respectively. The Igeo confirmed moderate to heavily contaminated soils and sediments. Additionally, the RCR exceeded the quotient 1 for all metals, suggesting a significant ecological risk. High MF (up to 70 %) was observed for Cd in both sediments and soils. However, for Pb, Cu and Zn an average of 15 % was observed only in sediments. This study reveals that physicochemical characteristics, pH, Eh, texture, organic matter and CEC influence metal mobility and indicate anthropogenic metal contamination in readily available forms, highlighting the importance of comprehensive physicochemical evaluations and integrative use of different pollution indicators when assessing contamination levels and evaluating associated risks of polluted environments to both human health and the environment.
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来源期刊
Case Studies in Chemical and Environmental Engineering
Case Studies in Chemical and Environmental Engineering Engineering-Engineering (miscellaneous)
CiteScore
9.20
自引率
0.00%
发文量
103
审稿时长
40 days
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