Determination polarographique de la nitrohydroxylamine

The catalytic wave of nitrohydroxylamine in the presence of divalent cobalt can be used for the polarographic determination of this substance. The catalytic waves are well-developed in the following supporting electrolyte solution: NH₄Cl, 0.05 M; NH₄OH, 0.025 M; gelatine, 0.02%. The cobalt concentration should be about 10⁻³M for 10⁻⁴–10⁻⁵M N₂O₃²⁻ and 2.5 × 10⁻⁵M for 10⁻⁶–10⁻MN₂O₃²⁻. The other nitrogen-containing compounds present such as nitrate, nitrite, hyponitrite and nitramide have little or no effect on the catalytic wave of nitrohydroxylamine. Only hydroxylamine interferes with the determination.