Coates Sign Flow Graph of Carbonate Water Chemical Equilibrium System and the Solution of Mathcad Zhang Yulei, Xie Xiezhong, Jiang Lin# (College of Hydraulic Civil Engineering, Tai'an 271018) (#College of Applied Chemistry and Material Science, Shandong Agricultural University, Tai'an 271018) Abstract Degree of freedom of chemical equilibrium system in carbonate water is analyzed by establishing the model of coates sign flow graph, and the relationship of equilibrium concentration is deduced according to the coates sign flow graph. In the mean time, two equilibrium systems in water chemistry are calculated in detail. Key words Coates sign flow graph, Water chemistry, Chemical equilibrium system, Carbonate, Surface water, Mathcad 碳酸盐水化学平衡系统 Coates 信号流图模型与 Mathcad 求解 张玉镭 谢协忠 姜 林# (山东农业大学水利土木工程学院 #山东农业大学应用化学与材料科学学院 泰安 271018) 摘要 建立了化学平衡系统 Coates 信号流图模型，对碳酸盐离子平衡系统的 Coates 信号流图模型作了自由度分析，并依据 Coates 信号流图推导平衡浓度关系式。对两个水化学平衡系统进行了数值计算。 关键词 水化学 化学平衡 碳酸盐 地面水 Mathcad 张玉镭 男，40 岁，讲师，主要从事水化学及水处理技术方面的研究。E-mail: vhyulz@sina.com 2003-02-09 收稿 (PDF全文下载c04012)