中文摘要：

通过等温吸附实验,研究了加硅对2种不同pH水田土壤吸附铅特性的影响。实验中用硝酸中和硅酸钠的碱性,各处理间钠离子和硝酸根离子的差异以硝酸钠补齐,消除了因硅酸盐的加入改变体系pH及伴随离子对土壤吸附铅可能产生的影响。结果表明,在本实验条件下,Langmuir方程、Freundlich方程和Temkin方程都能较好地描述不同硅浓度条件下两种土壤对铅的吸附特征,但以Freundlich模型为最优;加硅促进了酸性土壤对铅的吸附,抑制了碱性土壤对铅的吸附。

英文摘要：

Adsorption isotherm experiments were conducted to investigate the effect of silicon on the adsorption of lead on paddy soils with different pH.HNO3 was used to neutralize the alkalinity of Na2SiO3.The difference of sodium ion and nitrate ion was completed with NaNO3.The effect of silicon addition on the pH of soil and the affection caused by the attendant ion were eliminated.The results showed that among the three isothermal absorption models（Langmuir,Freundlich and Temkin）,the Freundlich was optimal to simulate the adsorption.When added the same amount silicon the impact of the adsorption of lead on the two soils was different,the adsorption capacity of lead in acid soils increased,and the capacity in alkaline soil decreased.