【摘要】 为评价Cd2+对上海临港新城滨海地区盐渍土壤的影响,通过研究探讨该土壤对Cd2+的吸附行为及吸附机理.结果表明:Cd2+在上海临港新城滨海盐渍土壤中的吸附行为符合Langmuir等温吸附曲线;pH值对土壤中Cd2+的吸附量有明显影响,当pH值介于4～9时吸附量随pH值的增大而急剧增大,当pH值继续增大时吸附量下降并趋于平缓;电解质氯化钠可显著抑制土壤对Cd2+的吸附,随着氯化钠浓度的增大,吸附量先急剧下降,随后趋于平缓;温度升高有利于土壤对Cd2+的吸附,说明上海临港新城滨海盐渍土壤对外源Cd2+的缓冲能力以及土壤中Cd2+的迁移性和活性具有季节性差异.更多还原

【Abstract】 To evaluate the effect of Cd2+ on coastal saline soil in Shanghai Lingang New City,adsorption behavior of the soil to Cd2+ is studied,and the adsorption mechanism is explored.The results show that the adsorption behavior of Cd2+ on coastal saline soil in Shanghai Lingang New City conforms to Langmuir isotherm.The pH of the saline soil influences the adsorption amount of Cd2+ significantly.The adsorption amount increases rapidly with the pH increasing from 4 to 9,and the adsorption amount decreases and then declines to a stable level when the pH continue to increase.Electrolyte NaCl can obviously inhibit the adsorption of Cd2+ on coastal saline soil,the adsorption amount firstly decreases sharply and then tends to be stable with the increase of NaCl concentration.Temperature is conducive to the adsorption of Cd2+ on coastal saline soil,which means that the buffering capacity of the soil in Shanghai Lingang New City and the mobility and activity of Cd2+ in this soil have seasonal difference.更多还原