用pH电势法研究不同甘草酸铵浓度和不同温度时甘草酸铵对抗坏血酸与铅配合能力的影响.在生理条件下,甘草酸铵的浓度为5.0×10^-4mol／L时,抗坏血酸与铅配合稳定带数为lgk₁＝8.72,lgk₂＝6.91.结果表明,随温度降低和甘草酸铵浓度增大,配合稳定常数增大.

Stability constant of ascorbic acid and lead complex was measured bY PH potentiomet-ry at different temperatures and concentrations of monoammonium glycyrrhizinate(MG).At a concentration of 5.0×10^-4mol／L and at biolugical condition,lgk₁=8.72 and lgk₂=6.91.The result suggested that the stability constant can be improved at decreased temp-eratures arid increased concentrations of MG.