例:铜铁试剂 log K=416km=14×10 在三氯甲烷中A3+logK=-3.50,Fe+logK=9.8 CL=0. 05 mo1/L 实验结果见图 Anal chim acta105,281(1979) 铜铁试剂的副反应系数 PH=8 RKDHLKH[HT DHL =1+ 48.3 1×151×14×104×10 Ig aH=1.67,Igaa=9.3 PH=9 IgaH=2.66, 1ge 铜铁试剂与 M++3HL=ML/o+3H* Ig D=lgKer -lgaM-31gaH +3lg CH+3pH 用此式计算D→E例：铜铁试剂 D log 2.18 K HL = D 151 K HL = log 4.16 H KHL = 4 1.4 10 H KHL =  在三氯甲烷中 3 3 Al log 3.50,Fe log 9.8 K K ex ex + + = − = CHL=0.05 mol/L , R=1 实验结果见图 Anal Chim Acta 105,281(1979) 铜铁试剂的副反应系数: PH=8 D D 1 1 1 [ ] HL H RK K H RK HL HL HL  + = + + 4 8 1 1 48.3 1 151 1.4 10 10− = + =     Al lg 1.67,lg 9.3   HL = = PH=9 D 1 1 [ ] HL H RK K H HL HL  + = + 4 9 1 1 474 1 151 1.4 10 10− = + =     ] Al lg 2.66,lg 13.3   HL = = 铜铁试剂与 3 M HL ML H 3 3 0 3(0) + + + = + lg 1 lg 3lg 3lg 3 D gK C pH = − − + + ex M HL HL   用此式计算 D→E