Study on Mechanisms of Cd^(2+) Sorption on Goethite byMicrocalorimetry  

作　　者：ZHANG GUIYIN WANG TIANZHI DONG YUANYAN LI XUEYUANI(1Huazhong Agricultural University, Wuhan 43OO7O (China))(2Agricultural University of Hebei, Baoding 071001 (China))(3 Wuhan University, Wuhan 450072 (China)) 

出　　处：《Pedosphere》1999年第4期357-362,共6页土壤圈（英文版）

摘　　要：A study on energy changes and mechanisms of Cd sorbed on goethite was performed using the technique ofmicrocalorimetry. The data of the amount of Cd sorption (Aq) and concentration of Cd in equilibrium solution(Ce), and the data of Aq and the heat effect (AH) caused by Cd^2+ sorption on goethite all fitted Langmuirisotherm. The amount of heat released from Cd sorption on goethite increased with the amount of Ce or Aq.The reaction process of Cd sorption on goethite may be divided into five stages and three plateaus, dependingon the variation of enthalpy change (.Hm) of Cd sorption with Aq, which implied three mechanisms ofinteraCtion between Cd and goethite. The experimental results showed that the microcalorimetry may beuseful for determination of microcalorie variation in soil.A study on energy changes and mechanisms of Cd sorbed on goethite was performed using the technique ofmicrocalorimetry. The data of the amount of Cd sorption (Aq) and concentration of Cd in equilibrium solution(Ce), and the data of Aq and the heat effect (AH) caused by Cd^2+ sorption on goethite all fitted Langmuirisotherm. The amount of heat released from Cd sorption on goethite increased with the amount of Ce or Aq.The reaction process of Cd sorption on goethite may be divided into five stages and three plateaus, dependingon the variation of enthalpy change (.Hm) of Cd sorption with Aq, which implied three mechanisms ofinteraCtion between Cd and goethite. The experimental results showed that the microcalorimetry may beuseful for determination of microcalorie variation in soil.

关 键 词：CADMIUM GOETHITE heat effect MICROCALORIMETRY SORPTION 

分 类 号：S153.1[农业科学—土壤学] X131.3[农业科学—农业基础科学]