多离子体系中黄河沉积物对重金属的竞争吸附研究

Competition Adsorption on Heavy Metals of the Yellow River Sediments in the Polyion Coexisting System

以黄河包头段上游清洁河段的沉积物为吸附剂 ,以Pb2 + 、Cu2 + 、Zn2 + 、Cd2 + 4种离子的混合溶液体系为吸附质 ,开展了重金属离子在黄河沉积物中的竞争吸附及其影响因素等实验研究。结果表明 ,混合溶液体系中不同离子间的吸附竞争有显著的拮抗或协同效应关系 ,4种重金属离子在黄河沉积物中竞争吸附的能力依序为Pb2 + ≥Cu2 +>Zn2 + ≥Cd2 + 。

Sediments are taken from the clean reach in the Baotou section of the Yellow Riv er as the adsorbent, the mixed solution system made up of Pb 2+ , Cu 2+ , Zn 2+ and Cd 2+ as the adsorbate, experimental research has been car ried out on the competition adsorption of the Yellow River sediments on heavy me tals. The experiment has clarified the competitive adsorption order of Pb 2+ ≥ Cu 2+ > Zn 2+ ≥ Cd 2+ , the cooperative adsorption relation of Cu—Pb, Zn—Cd and the resistant adsorption relation of Cu—Zn, Cu—Cd, Pb— Zn and Pb—Cd. The study is of great significance in evaluating the potential ri sk of heavy metals in the river sediments.