摘要
土壤对重金属离子的吸附容量严格受H^+浓度的控制。本文通过试验探讨了H^+ 对Cu^(2+)——Pb^(2+),Cn^(2+)——Zu^(2+),Cu^(2+)——Hg^(2+)系统中Cu^(2+)吸附量的影响规律。当pH<pH时,Cu^(2+)吸附量随pH值增大而增大;当pH>pH时,Cu^(2+)吸附量随pH值增大而减小。对于酸性土,pH=6.5(初始值)或7.0(平衡值),对碱性土,pH=5.5(初始值)或7.8(平衡值)。在pH<pH_(ZPC)和pH>pH_(ZPC)时,吸附模式具有完全不同的形式。
The adsorption of heavy metal ions by soil is controlled strictly by H+ concen- tration. The author made a research about the influence of H+ on the adsorption of Cu2+-Pb2+, Cu2+-Zn2+, Cu2+-Hg2+ binary systems. When pH<pH, Cu(Ⅱ) absorbed capacity by soil increases with the increase of pH; when pH> pH, Cu(Ⅱ) absorbed capacity by soil decreases with the increase of pH. The pH = 6.5 (oringinal value) or 7.0 (equilibrium value), for acidic soil) the pH = 5.5 (oringinal value) or 7.8 (equilibrium value), for basic soil. When pH<pHzpc and pH>pHzpc ,the adsorption models show the very different forms,i.e.Where A, B are coefficents related to pH and total adsorption basis.
关键词
土壤
水文地球化学
吸附
soil, geohydrochemistry, heavy metal ion, adsorption
