Polarographic Behavior of Cobalt-1-Nitroso-2-naphthol Complex in Ammonium Citrate and Tartrate Solutions

The reduction behavior of cobalt(II) in ammonium citrate and tartrate solutions containing 1-nitroso-2-naphthol was investigated by means of d.c, a.c, normal and differential pulse polarography (n. p. p. and d. p. p.). When cobalt(II) is added to the supporting electrolyte of citrate or tartrate in the presence of the nitrosonaphthol, the reduction potential of 1-nitroso-2-naphthol shifts to a more negative value, the well-defined a. c. and d. p. p. peaks appearing. The drop time-potential curve indicated that adsorption of nitrosonaphthol as well as its reduction product at the mercury surface occurs. The analytical potentiality of the use of nitrosonaphthol for the microdetermination of cobalt(II) is also described.