研究地球化学机制的热动力学方法  

Methods of Thermodynamics for Studying Mechanism of Geochemistry

作　　者：唐元骏[1] 谭大芳[1] 

机构地区：[1]中国地质大学地球化学系,武汉430074

出　　处：《地球科学（中国地质大学学报）》1994年第3期329-336,共8页Earth Science-Journal of China University of Geosciences

摘　　要：文章介绍了热动力学方法的研究历史、研究原理以及在研究地球化学机制中的应用。如石膏的脱水反应机制可分二步进行,CaSO_4·2H_2O→CaSO_4·1/2H_2O→CaSO_4.活化能 E=118.7kJ/mol,脱水温度T≈380.60k,反应速率k_1=4.415×10^(-4)S^(-1)。方解石的溶解反应机制,在0～5000s期间以溶解反应为主,嗣后,发生周期性的溶解反应,热谱图上表现为化学振荡。We present the history and principle of thermodynamics and its application to mechanism of geochemistry. For example, the dehydration reaction tbr gypsum is divided into two steps, CaSO4·2H2O→CaSO4·1/2H2O→CaSO4.The activation energe E=118.7kJ·mol-1, dehydration temperdture T=350.60K and reaction rate k1=4.415×10-4s-1. The mechanism of so-lution reaction for calcite takes solution reaction as the dominant factor during 0 to 5000 se-conds, then the solution reaction occurs periodically and chemical vibration is shown in thermogram.

关 键 词：地球化学机制 热动力学 方解石 

分 类 号：P594[天文地球—地球化学]