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The photodegradation of tributyl-O-acetylcitrate in the atmosphere by reaction with OH radicals was calculated using the computer program AOPWIN (v 1.92). Based on the reaction rate constant k(OH)=14.4562 x 10E-12 cm³/molecule x sec at 25°C and assuming a OH radical concentration of 5 x 10E5 radicals/cm³ (24 -h day) a half-life t1/2 of ca. 27 h was calculated.

The base-catalysed hydrolysis rate constant of tributyl acetyl citrate was calculated by HYDROWIN program (v 2.00) published by the U.S. Environmental Protection Agency. Tributyl acetyl citrate is in the applicability of the model. The total aqueous base-catalysed rate constant (Kb) at ph > 8 and 25 °C has been calculated to be 5.755 x 10E-2 L/mol x sec. Predicted half-lifes of 3816 y (at pH 4), 3.82 y (at pH 7), 139.4 d (at pH 8) and 13.94 d (at pH 9) indicate moderate to slow hydrolysis of tributyl acety citrate under environmental conditions.