The system Co(II)-sulfanilic acid in unbuffered medium behaves polarographi
cally in a complicated manner, producing the main process encountered in th
e catalytic currents section. The behaviour of this system was similar with
cobalt-sodium nitrohydroxylaminate, in buffered media. The aim of this pap
er is to study the catalytic cobalt and hydrogen discharge in the Co(II)-su
lfanilic acid, with the purpose of obtaining new experimental results conce
rning the catalytic reactions of amino and sulfonic groups.