Heavy metals in urban and peri-urban soils of a heavily-populated and industrialized city: Assessment of ecological risks and human health repercussions
Heavy metals in urban and peri-urban soils of a heavily-populated and industrialized city: Assessment of ecological risks and human health repercussions
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DOI：
10.1080/10807039.2019.1601004
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
K. Mehmood;H. Ahmad;Roman Abbas; . Saifullah- ;G. Murtaza
中科院分区：
文献类型：
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作者：
K. Mehmood;H. Ahmad;Roman Abbas; . Saifullah- ;G. Murtaza
摘要土壤中重金属含量的增加已成为人类健康的一个严重问题，因为它们很容易通过受污染的食物链转移到人体内。对重金属的污染程度、来源和生态风险进行评估势在必行。为确定巴基斯坦费萨拉巴德这座人口稠密的工业化城市的土壤污染状况，估算了土壤污染指数(Igeo)、污染因子(Cf)、污染负荷指数(PLI)和人体健康风险。Cd的最大Cf(1.58)和Ph的最大PLI值为1.22，Cd的最大Igeo(−)值为0.19。相关分析和主成分分析表明，研究区土壤中Cd和Pb2+的工业来源较为普遍。它清楚地表明，在过去的几十年里，在人口稠密和工业化的城市，重金属污染的显著水平来自当地工业、繁忙的商业中心和繁忙的交通负荷。在此基础上，利用土壤重金属浓度评价人体健康风险，包括危害指数HIexP(摄入、吸入、皮肤和致癌)和致癌风险(CR)。儿童铅和镉的HIexP值分别为10.30和4.56，均超过允许限值(HI=1)。致癌金属(钴、铬和镉)的CR在安全范围内(1E-06至1E-04)。然而，与儿童相比，成人的CR相对较高。目前的调查结果可以帮助制定研究区域的可持续战略，通过来源识别和污染缓解技术，最大限度地减少重金属进入食物链。
Abstract Increasing levels of heavy metals in soil have become a serious concern for human health because they can be easily transferred into the human body through contaminated food web. It is imperative to evaluate pollution levels, origin and ecological risks of heavy metals. The geoaccumaualtion (Igeo), contamination factor (CF), pollution load index (PLI) and human health risk were estimated to determine the soil pollution in Faisalabad, a heavily-populated and industrialized city of Pakistan. The maximum CF (1.58) and PLI (1.22) values were estimated for Cd and Pb, respectively, and maximum Igeo (−0.19) value was observed for Cd. Correlation analysis and principal component analysis suggested that common industrial sources for Cd and Pb were identified in the study sites. It clearly indicates that the significant levels of heavy metals pollution arise from local industries, busy commercial centers and heavy traffic load in the last few decades in heavily-populated and industrialized city. Further, soil heavy metals concentration were used to evaluate the human health risk such as chronic or non-carcinogenic including hazard indexes HIexP (ingestion, inhalation and dermal and carcinogenic) and cancer risk (CR). The HIexP values of Pb (10.30) and Cd (4.56) were found above the permissible limit (HI = 1) for children. The CR due to carcinogenic metals (Co, Cr and Cd) are within the safe limit (1E-06 to 1E-04). However, CR was comparatively higher in adults as compared to children. The results from the current investigation can help to develop a sustainable strategy in the study region to minimize the entry of heavy metals in food chain through source identification and pollution abatement techniques.