Agro-ecotechnology Laboratory, Centre for Rural Technology, Indian Institute of Technology Guwahati (IITG), Assam, 781039, India.
Agro-ecotechnology Laboratory, Centre for Rural Technology, Indian Institute of Technology Guwahati (IITG), Assam, 781039, India; Applied Biodiversity Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG), Assam-781039, India.
Chemosphere. 2021 May;271:129573. doi: 10.1016/j.chemosphere.2021.129573. Epub 2021 Jan 7.
Unscientific municipal solid waste (MSW) dumping provokes heavy metal (HM) associated ecological and human health hazards through heightened bioavailability and bioaccumulation. In this study, we focused on three important HMs Cadmium (Cd), Copper (Cu) and Nickel (Ni) and their geochemical fractions, to enable clutter free data management, analysis and interpretation. Stratified random soil sampling was carried out from twenty different locations around a Ramsar site (Deepor Beel) in Guwahati, India. The spatial concentration profiles of Cd, Cu and Ni were determined by data elicited from geochemical fractionation and the Geographic Information System (GIS). Ecological and health risks indices were used to evaluate the severity of soil pollution and assess the level of health risks. All the three HMs thus evaluated, conformed to the potential bioavailable category. Cd (54.59%) was associated mostly with the carbonate bound fraction (F3), while 25.53% of Cu and 40.60% Ni were associated with the exchangeable fraction (F2). Significant contamination levels and higher ecological risks posed by these metals were in the order Cd > Ni > Cu. Children were found to be more vulnerable towards Cd associated health risks whereas, Ni posed threats to both adults and children. Cu posed no risk to human health. Geochemical fractionation and different indices played a critical role in the integrated assessment of soil pollution, ecological and health risk assessment, and provided an empirical basis for the sustainable future planning and comprehensive adaptive management practices for MSW.
不科学的城市固体废物（MSW）倾倒通过提高生物利用度和生物积累，引发了与重金属（HM）相关的生态和人类健康危害。在这项研究中，我们专注于三种重要的重金属镉（Cd）、铜（Cu）和镍（Ni）及其地球化学形态，以便能够进行无杂乱的数据管理、分析和解释。在印度古瓦哈蒂的一个拉姆萨尔地点（Deepor Beel）周围的二十个不同地点进行了分层随机土壤采样。Cd、Cu 和 Ni 的空间浓度分布通过地球化学形态分离和地理信息系统（GIS）获得的数据来确定。生态和健康风险指数用于评估土壤污染的严重程度并评估健康风险水平。所有这三种经过评估的重金属都符合潜在的生物利用类别。Cd（54.59%）主要与碳酸盐结合部分（F3）有关，而 25.53%的 Cu 和 40.60%的 Ni 与可交换部分（F2）有关。这些金属的显著污染水平和更高的生态风险顺序为 Cd>Ni>Cu。发现儿童更容易受到 Cd 相关健康风险的影响，而 Ni 对成人和儿童都构成威胁。Cu 对人类健康没有风险。地球化学形态分离和不同的指数在土壤污染的综合评估、生态和健康风险评估中发挥了关键作用，并为 MSW 的可持续未来规划和综合适应管理实践提供了经验基础。
