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三元络合反应达到平衡时: K稳=[M_aA_bB_c]/[M]~a[a]~b[B]~c (1) 在试验时,保持此体系总的初始摩尔浓度之和为一常数,仅改变三者各自的浓度即: C_M+C_A+C_B=C_O(常数) (2) 其中C_M、C_A和C_B分别为金属离子M,配位体A及配位体B的初始浓度。如果被测络合物M_aA_bB_c的吸光度相对溶液的表观吸光度是绝对主要的,则溶液的表观吸光度与M_aA_bB_c的浓度成正比:
When the ternary complexation reaction reaches equilibrium: K steady = [M_aA_bB_c] / [M] ~ a [a] ~ b [B] ~ c (1) The sum of the total initial molar concentrations of this system Constant, just change the concentration of each of the three: C_M + C_A + C_B = C_O (constant) (2) where C_M, C_A and C_B are the initial concentrations of metal ions M, Ligand A and Ligand B, respectively. If the measured absorbance of the complex M_aA_bB_c is relative to the apparent absorbance of the solution, then the apparent absorbance of the solution is proportional to the concentration of M_aA_bB_c: