The rate constants, k(1) and k(2) for the reactions of C2F5OC(O)H and n-C3F7OC(O)H with OH radicals were measured using an FT-IR technique at 253-328 K. k(1) and k(2) were determined as (9.24 +/- 1.33) x 10(-13) exp[-(1230 +/- 40)/T] and (1.41 +/- 0.26) x 10(-12) exp[-(1260 +/-50)/T] cm(3) molecule(-1) s(-1). The random errors reported are +/-2 sigma, and potential systematic errors of 10% could add to the k(1) and k(2). The atmospheric lifetimes of C2F5OC(O)H and n-C3F7OC(O)H with respect to reaction with OH radicals were estimated at 3.6 and 2.6 years, respectively. (C) 2004 Elsevier B.V. All rights reserved.