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

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

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。

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/potassium ions acted still in accordance with the universal rule of ion exchange, but remained contradictory to the ratio law; The mechanisms of adsorbed/displaced mole ratio being less than 1 between aluminium/manganous and calcium/potassium ions and for exchange of potassium by calcium ion were discussed; Parameters k, r, 1/n, K and AF were also explained, and in this regard k and K were much higher and lower in value respectively. In view of AF, 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 calcium ion was revealed.