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关于土壤胶体对阳离子的结合能问题,Marshall等已应用粘土膜电极,从粘土矿物的类型、阳离子的种类、阳离子饱和度等方面,进行了大量的工作。本工作是应用对钠离子或钾离子具有专性反应的玻璃电极进行测定,并试图将土壤对阳离子的结合能与土壤的电荷性质联系起来考虑。材料和方法选用了两种电荷性质不同的土壤。砖红壤(广东徐闻)的负电荷量较少,其数量具有很大的可变性,并带有大量正电荷;黄棕壤(南京)的负电荷量较多,但其中可变电荷量很少。在电渗折或用酸处理后的氢铝质土壤悬液中加入不同量的NaOH(或KOH)与NaCl(或KCl),平衡后用玻璃电极测离子活度,并按照Marshall的公式△F=RTlnc/a
With regard to the binding energy of soil colloids to cations, Marshall et al. Have used clayy membrane electrodes for a great deal of work in terms of the types of clay minerals, the types of cations, the degree of cation saturation, and the like. In this work, the glass electrode with specific reaction to sodium ion or potassium ion is used for determination, and it is considered that the binding energy of soil to cation is related to the charge property of soil. Materials and Methods Two soil types with different charge properties were chosen. The amount of negative charge of brick red soil (Guangdong Xuwen) is less, its quantity has a great variability, and with a large amount of positive charge; yellow brown soil (Nanjing) more negative charge, but the variable charge is small . After electrodialysis or acid-treated aluminum-aluminum soil suspensions, different amounts of NaOH (or KOH) and NaCl (or KCl) were added. After equilibrium, the ion activity was measured by the glass electrode and determined according to Marshall’s formula △ F = RTlnc / a