in water Electrolysis; constant potential electrolysis (0.5-1.35 V vs. SCE) of nitrate/nitrite soln. (3 M NaOH, 0.25 M Na2CO3 base electrolyte) under N2, O2, air or N2/O2 atmosphere, 25-80°C, using platinum, nickel or platinized nickel electrodes; current efficiency estimation, mass spectrometry (gaseous products), ion chromatography, optical detection (202 nm); also NH3 detected at higher current densities;

lead in neat (no solvent) byproducts: lead oxide; Na(15)NO3 and lead fillings ground in a mortar, stirred and heated at 350°C for 1.5 h on a open flame, cooled, water added, stirred; lead oxide removed by filtration, water distilled off in vacuo, dried in vacuo;

H2SO4; Hg in sulfuric acid byproducts: (15)N2O; aq. H2SO4; in vac.; slow addn. of 80percent H2SO4 to mixt. of Na(15)NO3 and Hg, shaking at room temp. for 1 h; passing through trap at -100°C, condensing at -196°C; contg. (15)N2O as impurity;