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在试验条件下,所得黄棕壤、红壤、砖红壤对锌吸附的等温线基本上是直线,相当于吸附等温线的第一区.这是由于该区域内吸附位和Zn~(2+)离子结合能高;Zn溶液的起始浓度低所致.吸附等温线用回归方程式拟合处理相关性很好,相关系数(r)在0.986~(***)～0.999~(***)之间.土壤中氧化铁对锌的专性吸附有明显的影响.土壤去铁后吸锌量降低,黄棕壤降低36.9%,红壤为19.6%,砖红壤为16%,其递降顺序与土壤中铁的活化度有明显关系.因铁的活化度高,可提供专性吸附位亦多.
Under the experimental conditions, the adsorption isotherms of yellow brown earth, red soil and latosol are basically linear, which is equivalent to the first zone of adsorption isotherm because of the adsorption sites and Zn 2+ in this region, Ion binding energy is high, and the initial concentration of Zn solution is low.The adsorption isotherms are well correlated with regression equation fitting, the correlation coefficient (r) is between 0.986 and 0.999 ~ (***) .The iron oxide in the soil has a significant effect on the zinc adsorption.The amount of zinc in the soil is reduced after removing iron, the yellow brown soil is reduced by 36.9%, the red soil is 19.6%, the red soil is 16% There is a clear relationship between the degree of activation of iron and iron because of the high degree of activation of the iron, can provide specific adsorption sites are also many.