写 01- =0.2 0.4 一0.6+-0.8-1.0 Ede(vs.SCE)V Polarographic waves of different concentrations of Cd2+ ICd]: 1-2.8X10-年g-5.6X10+；3-1.1X10-g 5.510-M,in 1M KCI solution i(mA) Ede (vs.SCE)V Polarographic waves of different concentrations of Cd2+ [Cd2+]： in 1M KCl solution