【摘要】 采用平衡吸附法研究了潮褐土、红壤对Cu2+的等温吸附以及不同pH和电解质对土壤吸附Cu2+的影响。结果表明,(1)土壤对Cu2+的吸附量随平衡溶液中Cu2+浓度增加而增加,潮褐土Cu2+最大吸附量明显比红壤的高,约是红壤的4-5倍。(2)体系pH显著影响土壤对Cu2+的吸附,随pH升高Cu2+吸附率增加,基本呈S形曲线变化。(3)随体系电解质浓度的增加,土壤对Cu2+吸附率的变化趋势因土壤性质及体系中电解质种类、浓度的不同而不同。随KNO3浓度提高,土壤Cu2+吸附率降低。KCl、KH2PO4对潮褐土吸附Cu2+的影响与红壤的有些不同,低浓度KCl、KH2PO4抑制潮褐土对Cu2+的吸附,高浓度KCl、KH2PO4促进潮褐土对Cu2+的吸附,而对红壤,KCl降低Cu2+的吸附率,KH2PO4提高Cu2+的吸附率,但随KH2PO4浓度的提高,其提高幅度逐渐减弱。 2+更多还原

【Abstract】 Cu2+ adsorption isotherms and the influence of electrolyte on the adsorption of Cu2+ were examined for two soils: meadow cinnamon soil and red soil .The results showed that (1) Cu2+ amounts adsorbed by soils increased with the initial concentrations of Cu2+ added. The soil maximum adsorbed Cu2+ is in the order: meadow cinnamon>red soil. (2) Adsorption of Cu2+ increased with rising pH. (3) Increasing the concentration of electrolyte (from 0 to 100 mmolL-1 KCl, or from 0 to 500 mmolL-1 KNO3) caused a decrease of Cu2+ adsorption. The influence of KH2PO4 on Cu2+ adsorption in meadow cinnamon soil is the same to the KCl, but in red soil, increasing concentration of KH2PO4 caused an increase in Cu2+ adsorption.更多还原