The wet oxidation of thiocyanate has been investigated in a I-L semibatch reactor at temperatures in the range of 438.15-468.15 K and total pressures between 2.0 x 10(3) kPa and 8.1 x 10(3) kPa. The initial pH value of the reaction media was varied between pH 2 and pH 12 and was found to be a key parameter in the rate of thiocyanate degradation. The evolution of concentration of substrate and products (sulfate and ammonium) were analyzed. Based on the experimental data and bibliography information, a kinetic model was obtained and, here, possible pathways, depending on the initial pH of the media, are suggested for thiocyanate oxidation.