红壤对铝锰离子的吸附特征 Ⅴ.稀溶液中铝锰离子的交换吸附行为

研究了贴近自然的稀溶液条件下铝、锰离子交换吸附的行为，结果是：铝、锰与钙、钾离子的交换吸附仍符合一般的离子交换规律，但也不遵守比例定律。讨论了代入量／代出量的摩尔比〈1时的交换吸附、临界点及其机理。对k、K、1/n、r进行了表述，其中k偏高，K则偏低。从热力学角度进一步论证了红壤铝质化即酸化的自然趋势，并揭示了钙与铝、钾离子交换吸附的能量特征。

EXCHANGE-ADSORPTION CHARACTERISTICS OF ALUMINIUM AND MANGANOUS IONS BY RED SOILS V. EXCHANGE-ADSORPTION BEHAVIOURS OF ALUMINIUM AND MANGANOUS IONS IN DILUTE SOLUTION

A study on exchange-adsorption of aluminium and manganous ions under conditions close to the field was carried out.The principal results were shown as follows:The exchange-adsorption between aluminium/manganous and calcium/potassiumions acted still in accordance with the universal rule of ion exchange,but remained contradictory to the ratio law;The mechanisms of adsorbed/displaced mole rat io being less than 1 between aluminium/manganous and calcium/potassiumions and for exchange of potassium by calciumion were discussed;Parameters k,r,1/n,K and $F were also explained,and in this regard k and K were much higher and lower in value respectively.In view of $F,the natural tendency of acidification as a result of aluminium transformation in red soils was further proved in thermodynamics,and the energy characteristics for exchange-adsorption of aluminum and potassium by calciumion was revealed.