The kinetics of the gas-phase reactions of chlorine atoms with H-chloroform and D-chloroform was studied experimentally. The relative rate method was applied using Cl + CH3Br as the reference reaction. The rate constants for H-abstraction from CHCl3 (k(H)) and D-abstraction from CDCl3 (k(D)) were measured in the temperature range of 297-527 K and at total pressure of 100 Torr. The derived temperature dependencies of the rate constants are given by k(H) = (4.8 +/- 0.5) x 10(12) x exp(-1160 +/- 30/T) and k(D) = (6.4 +/- 2.1) x 10(12) x exp(-1660 +/-110/T) cm(3) molecule(1) s(1). The kinetic isotope effect described by the ratio k(H)/k(D) was (0.77 +/- 0.25) x exp(500 +/- 95/T). (C) 2009 Elsevier B. V. All rights reserved.