华中地区几种可变电荷土壤对SO_4^(2-)吸附的研究  

A STUDY ON SULFATE ADSORPTION BY SOME VARIABLE CHARGE SOILS IN CENTRAL CHINA

作　　者：董元彦[1] 王淑玉[1] 邓友军[1] 李学垣[1] 

机构地区：[1]华中农业大学,武汉430070

出　　处：《华中农业大学学报》1990年第1期74-79,共6页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金

摘　　要：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。Sulfate adsorption properties of soils with variable charge in central China were stu-died. Purplish soil did not adsorpt sulfate, because there was not extractive acid. Mi-neral analysis showed that illite was the main clay minerals in purplish soil. In othersoil samples, such as red earth, yellow brown earth and granite weathering product,th edominant clay minerals were koalinite and 14(?) intergrade mineral, and there wasvariable negative charge on the surface of clay particles. The amount of sulfate adsorp-tion by these soils increased with acidity. As pH value is fixed, sulfate adsorptionconforms well to both of the Langmuir and the Freundlich isotherms. When sulfatewas adsorpted, the secondary adsorption of cations by soil, increase with negativecharge on clay particles, there is a linear relationship between the sulfate adsorptionand the secondary adsorption of cations.

关 键 词：土壤 离子吸附 可变负电荷 华中地区 硫酸根离子 

分 类 号：S153[农业科学—土壤学]