Using Mcllvaine buffer solution (pH 4.9), picric acid gave well. shaped wave with three peaks appeared at -0.22v, -0.33v and -0.43v (vs.SCE), or at -0.21v,-0.31vand-0.40v (vs. Ag/AgCl).

• 的MCllvaine缓冲溶液(pH4.；9)中；苦味酸有良好的示波极谱峰和微分脉冲极谱峰；其3个峰的电位于-0