Hasan Maria, Kausar Dilshad, Akhter Gulraiz, Shah Munir H
Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Department of Earth Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Ecotoxicol Environ Saf. 2018 Jan;147:283-291. doi: 10.1016/j.ecoenv.2017.08.054. Epub 2017 Sep 14.
Comparative distribution and mobility of selected essential and toxic metals in the paddy soil from district Sargodha, Pakistan was evaluated by the modified Community Bureau of Reference (mBCR) sequential extraction procedure. Most of the soil samples showed slightly alkaline nature while the soil texture was predominantly silty loam in nature. The metal contents were quantified in the exchangeable, reducible, oxidisable and residual fractions of the soil by flame atomic absorption spectrophotometry and the metal data were subjected to the statistical analyses in order to evaluate the mutual relationships among the metals in each fraction. Among the metals, Ca, Sr and Mn were found to be more mobile in the soil. A number of significant correlations between different metal pairs were noted in various fractions. Contamination factor, geoaccumulation index and enrichment factor revealed extremely severe enrichment/contamination for Cd; moderate to significant enrichment/contamination for Ni, Zn, Co and Pb while Cr, Sr, Cu and Mn revealed minimal to moderate contamination and accumulation in the soil. Multivariate cluster analysis showed significant anthropogenic intrusions of the metals in various fractions.
采用改进的欧洲共同体标准局（mBCR）连续提取法，对巴基斯坦萨戈达地区稻田土壤中选定的必需金属和有毒金属的分布及迁移性进行了评估。大多数土壤样品呈微碱性，土壤质地主要为粉质壤土。通过火焰原子吸收分光光度法对土壤中可交换态、可还原态、可氧化态和残渣态部分的金属含量进行了定量分析，并对金属数据进行了统计分析，以评估各部分中金属之间的相互关系。在这些金属中，钙、锶和锰在土壤中迁移性更强。在不同部分中，不同金属对之间存在许多显著的相关性。污染系数、地累积指数和富集系数表明，镉存在极其严重的富集/污染；镍、锌、钴和铅存在中度至显著的富集/污染，而铬、锶、铜和锰在土壤中的污染及累积程度为轻度至中度。多变量聚类分析表明，各部分金属存在显著的人为干扰。
