Abstract：The heavy metal-polluted soil can be recovered by plant repairing technique. In order to study the stability of complex formed in this process, the baicalin-cobalt (II) complex was used as an example in experiments. The stability constant of complex formed by baicalin and cobalt ion was determined by pH potentiometric titration at room temperature and atmospheric pressure. The mixture of baicalin solution and cobalt ion in certain solution system was titrated using potassium hydroxide standard solution. The pH change of solution in reaction process was recorded using automatic potential data acquisition software. The first-order and second-order stability constant of baicalin-cobalt(II) complex was calculated by generation function intercept method, respectively, i.e., lgKCoA1=5.89 and lgKCoA2=5.07. The distribution of various species of baicalin-cobalt (II) complex under different pH conditions was analyzed. It could be found that the environment of pH＞8 was advantageous to the synthesis of complex. The study provided theoretical basis for the recovery of weakly alkaline heavy metal-polluted soil by plant repairing technique.
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