The reduction of 2-ethylpicolinate (1), 2-formylpyridine (2) and picolinic acid (3) in 0.5 to 5 M H2SO4 solution was studied by voltamperometry on lead electrodes between 15 and 65 degrees C. The running curves show a partial passivation of the cathode; it is assumed that a viscous layer of polymeric products is formed on the surface. Under potentiostatic conditions the quasi-stationary current increased with the temperature and acidity. Compounds land 3 show some similarities, while the difference between the behaviour of compounds 1 and 2 results from the non-reducible hydrated form of 2, which is in equilibrium with its free form. Equilibrium data for 2 were measured by an amperometric technique.