废弃铅冶炼厂及周边土壤铅分布特征
Journal of Lanzhou University（Natural Sciences）（2019）
Abstract
选择甘肃某废弃铅冶炼厂,对厂内及周边土壤中w(Pb)及Pb形态在粒度和深度上的分布特征进行了研究.结果表明,废弃铅冶炼厂内(Ⅰ区)土壤平均w(Pb)远高于其他区域,且远超出土壤环境质量三级标准(GB15618-1995),已受到严重污染;废弃铅冶炼厂外围(O区)、雨水冲积区(R区)符合土壤环境质量二级标准.Ⅰ区土壤Pb主要分布在粒径＞2.00 mm土壤中,受冶炼废渣影响,以可还原态和弱酸提取态为主;O和R区w(Pb)随粒径增加而先升后降,主要分布在0.15～0.85 mm粒径土壤中,以可还原态为主.废弃厂外围土壤w(Pb)在纵向上总体随深度增加而降低;R区w(Pb)表现出随土壤深度增加而先增后减再增的规律,主要分布在20～40 cm深度土壤中.围墙可有效阻隔废弃厂内Pb向外的迁移,但风力扬尘、雨水淋滤仍使Pb向外迁移,导致O和R区土壤w(Pb)升高.
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