In present work, a two-temperature chemically non-equilibrium (2T-NCE) model has been studied for Ar-CH4-O-2 inductively coupled thermal plasma (ICTP) at reduced pressure from the viewpoint of interaction between plasma and fuel combustion. Chemically non-equilibrium effects have been taken into account by solving mass conservation equations for each of 22 particles considering convection, diffusion and net production effects. Species density of each particle or simply particle composition was also derived from the mass conservation equation of each one taking the non chemical equilibrium effect into account. For the net production term, totally 196 chemical reactions were taken into account including dissociation, ionization and other chemical reactions and their backward reactions. Finally, heat profile due to individual reaction and the total contribution of all reactions to the heat generated has been observed. (C) 2009 Elsevier B.V. All rights reserved.