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采用ｐＨ电位滴定－联机处理法测定了四种水溶性卟啉的一级解离常数，同时求得了这一过程的热力学函数值△Ｇ，△Ｈ和△Ｓ。
The first-order dissociation constants of four water-soluble porphyrins were determined by pH potentiometric titration-on-line method. The thermodynamic function values △ G, △ H and △ S of this process were also obtained.