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本文研究了华中地区红壤等4种土壤对SO_4~(2-)的吸附性质。紫色土的粘土矿物组成主要是水云母等2:1型粘土矿物,有机质含量低,不含交换酸,不能吸附SO_4~(2-)。红壤(湖北、湖南各取一个样)、黄棕壤的粘土矿物组成以高岭石、水云母为主,黄棕壤还含有14埃矿物等,土壤粘粒表面具有一定量的可变负电荷;对SO_4~(2-)的吸附量均随酸度增高而增大,在酸度一定时,均服从Langmuir吸附等温式和Freundlich吸附等温式。土壤吸附了SO_4~(2-)后表面负电荷增多,对Cu~(2+)的次级吸附量随之增加,并与SO_4~(2-)初级吸附量有线性关系。
In this paper, the adsorption properties of SO_4 ~ (2-) on four kinds of soils, such as red soil, were studied. The clay minerals of purple soil mainly consist of 2: 1 type clay minerals such as aqua mica with low content of organic matter, no exchange acid and no adsorption of SO 4 2-. The red clay (one from Hubei and one from Hunan) is composed of kaolinite and water mica in the yellow-brown soil. The yellow-brown soil also contains 14 angstroms of minerals. The soil clay surface has a certain amount of variable negative charge ; The adsorption amount of SO_4 ~ (2-) increased with the increase of acidity, and all of them were subjected to Langmuir adsorption isotherm and Freundlich adsorption isotherm at certain acidity. The adsorption of SO_4 ~ (2-) on the soil increased with the increase of negative charges on the secondary adsorption of Cu ~ (2+), which was linear with the primary adsorption of SO_4 ~ (2-).