矿业城市煤矸石山周边土壤重金属分布特征与影响因素研究

发布时间：2018-06-15 01:29

  本文选题：矸石山 + 土壤　； 参考：《生态环境学报》2017年03期

【摘要】：以阜新海州井工矿煤矸石山为研究对象,在矸石山东南、东北、西南和西北4个方向50 m范围内共采集表层土壤样品32个,研究煤矸石堆放对周边土壤重金属污染的危害程度,分析土壤中重金属的生物有效性,评价土壤中重金属的污染程度及影响其分布的因素。结果表明:研究区域土壤中5种重金属Zn、Pb、Cu、Cr和Ni中,Pb、Cu、Cr和Ni含量的平均值均高于土壤背景值,其中Ni和Cu的含量分别为土壤环境质量Ⅱ级(GB15618—1995)标准值的1.49倍和1.76倍。土壤中重金属含量基本呈现出随着距煤矸石堆距离的增加而下降的趋势。单因子污染指数和内梅罗综合污染指数法评价结果为重金属Ni单项污染水平最高,有28.1%的样本处于轻度污染水平,研究区域土壤中5种重金属综合污染指数大于1,土壤处于轻度污染。BCR顺序提取法对研究区域土壤中重金属形态的分析结果显示,5种重金属都以残渣态为主要存在形态,弱酸溶态含量仅占总量的2.09%~10.8%。统计分析结果显示,研究区域32个土壤样品中重金属的形态分布未呈随土壤pH值变化而变化趋势,土壤有机质与相应土壤中重金属形态分布相关性分析数据表明,土壤有机质不是影响研究区域土壤中重金属分布的主要因素。
[Abstract]:A total of 32 surface soil samples were collected in the south, northeast, southwest and northwest of Fuxin Haizhou well mine coal gangue mountain within 50 m in the south, northeast, southwest and northwest of the region. The harm degree of the coal gangue stacking to the surrounding soil heavy metal pollution was studied. The bioavailability of heavy metals in soil was analyzed, and the pollution degree of heavy metals in soil and the factors affecting their distribution were evaluated. The results showed that the average values of five heavy metals, Zn, Pb, Cu, Cr and Ni, were higher than the soil background values, and the contents of Ni and Cu were 1.49 times and 1.76 times of the standard values of soil environmental quality grade 鈪，

本文编号：2019929