Abstract
A study has been carried out on the reduction of nicotinamide (NA) by dc and DP polarography and linear sweep cyclic voltammetry in acidic media (pH < 3). Tafel slopes and reaction orders were also obtained at potentials corresponding to the foot of the polarographic wave. In the pH range studied the species in solution is the form protonated in the pyridine ring. In very strong acidic medium the rate-determining step of the process is a protonation reaction placed between two one-electron transfers. For 0 < pH < 3 a gem-hydroxylamine formed after two one-electron transfers can eliminate an ammonia molecule by two concurrent reactions. The limiting current of the wave is partially controlled by these reactions and the process appears as ECE.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
