| 摘要: |
| 用一次平衡法研究结果表明:土壤附铅、镉的等温线均符合于Langmuir方程,Freundlich方程和Temkin方程。用Temkin方程处理可将吸附量与化学位或结合能沟通起来。三种土壤吸附铅的量及结合能为:黄泥巴>黑垆土>红油土;吸附镉的量及结合能为:红油土>黑垆土>黄泥巴。温度升高,吸附量增大,吸附热均为正值。当pH值分别为4.0和5.0时,铅、镉吸附量分别突增。土壤去有机质后,铅吸附量变化不大,而镉吸附量明显下降。 |
| 关键词: 土壤污染,重金属污染,镉,铅,化学吸附 |
| DOI： |
| 分类号: |
| 基金项目:西北农业大学青年科学基金资助项目 |
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| Studies on the Adsorption Properties of Lead, Cadmium in Three Kinds of Shaanxi Soils |
|
Yang Yati Bai Jingling Cao Chuilan Lu Dagong
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| Abstract: |
| The adsorption properties of Lead, Cadmium in three kinds of Shaanxi Soils were studied using equilibrium. The results showed that Pb, Cd adsorption isotherms of tested soils followed the Langmuir equation, Freundlich equation and Temkin equation. Adsorption capacity and chemical potential or adsorption energy were linked with by Temkin equation. Adsorption capacity and adsorption energy of Pb in tested soils were in the sequence of Clayey losessal soil > dark cultivated loessal soil > old manured red loessal soil; and that of Cd followed the orders of old manured red loessal soil > dark cultivated losessal soil > clayey loessal soil. The adsorption capacity increased with an increase in temperature, the adsorption heat was possitive. When pH value was 4.0 and 5.0, the adsorption capacity of Pb and Cd increased very quickly. There is no much change in amount of Pb adsorption after the removal of organic matters while the amount of Cd adsorption dropped obviously. |
| Key words: soil pollution,heavy metal pollution,cadmium,lead,chemical adsorption |
