Department of Chemistry, D.A.V. College, Jalandhar-144 008 Department of Chemistry, Punjabi University, Patiala-147 002 Manuscript received 25 March 1997, revised 13 February 1998, accepted 27 February 1998 A polarographic method has been developed for the determination of zineb and rna neb in 0.1 M KCl and 2.0 M H2SO4 in 40% acetonitrile-formamide (4 : 1) at d.m.e. Each produces well-defined diffusion-controlled reversible anodic waves. The method has been applied for their determination in commercial samples.