Sulphur mustard vapor breakthrough behavior on whetlerite carbon has been studied by using modified Wheeler equation. The values of pseudo-first-order rate constant (k(v)) and kinetic saturation capacity (W-e) were calculated and the effects of various parameters such as bed height, air flow rate, concentration and temperature on the above parameters have also been studied. Rate constant is found to be increasing with air flow rate, while W-e is found to be invariable. Both k(v) and W-e decrease with the increase of temperature, however, no significant effect on W-e and k(v) is observed due to concentration change. The values of kinetic saturation capacity are used to predict the service livestbreakthrough times of carbon beds (when used in filtration systems). (c) 2006 Elsevier B.V. All rights reserved.