不同母质黑钙土对锌的吸附-解吸特性

研究了松嫩平原南部红土母质、黄土母质黑钙土0~20 cm、20~40 cm、40~60 cm层深的土壤对锌的吸附-解吸特性。结果表明:土壤对锌的吸附量与平衡液浓度成正比,且土壤的基本理化性质会影响其对锌的吸附能力。其中Freundlich方程拟合程度最好,其次为Langmuir方程,Temkin方程的拟合度相对较低,相关系数分别均0.99、0.96、0.94。土壤对锌的解吸量与吸附量成正比,不同土层土壤对锌的解吸能力不同。在同一平衡液质量浓度条件下,红土母质黑钙土1和黄土母质黑钙土1在0~20 cm层深土壤对锌的吸附强度最大,红土母质黑钙土2和黄土母质黑钙土2在20~40 cm层深土壤对锌的吸附强度最大。

Zinc Adsorption-Desorption Characteristics of Different Parent Material Chernozem

Zinc adsorption-desorption characteristics of loess parent material chernozem and laterite parent material chernozem in the 0-20 cm soil,20-40 cm soil and 40-60 cm soil from the southern part of Songnen plain were studied.The results showed that Zn adsorption of soil is proportionate to concentration of equilibrium liquid,and basic physical and chemical properties of soil can affect capacity of Zn adsorption.Zn isothermal adsorption curves fitted best with Langmuir equation,followed by Freundlich equation and Temkin equation,the coefficients of which are larger than 0.99,0.96 and 0.94,respectively.Zn desorption amount of soil is proportionate to Zn adsorption amount,and Zn adsorption of different soil layers was different.In the same concentration level loess parent material chernozem 1 and laterite parent material chernozem 1 have the largest adsorption capacity in the 0-20 cm soil,and loess parent material chernozem 2 and laterite parent material chernozem 2 have the largest adsorption capacity in the 20-40 cm soil.