Rate coefficients of hydroxyl radical reactions with pesticide molecules and related compounds: A review

Rate coefficients published in the literature on hydroxyl radical reactions with pesticides and related compounds are discussed together with the experimental methods and the basic reaction mechanisms. Recommendations are made for the most probable values. Most of the molecules whose rate coefficients are discussed have aromatic ring: their rate coefficients are in the range of 2 x 10(9)-1 x 10(10) mol(-1) dm(3) s(-1). The rate coefficients show some variation with the electron withdrawing-donating nature of the substituent on the ring. The rate coefficients for triazine pesticides (simazine, atrazine, prometon) are all around 2.5 x 10(9) mol(-1) dm(3) s(-1). The values do not show variation with the substituent on the s-triazine ring. The rate coefficients for the non-aromatic molecules which have C=C double bonds or several C-H bonds may also be above 1 x 10(9) mol(-1) dm(3) s(-1). However, the values for molecules without C=C double bonds or several C-H bonds are in the 1 x 10(7)-1 x 10(9) mol(-1) dm(3) s(-1) range. (C) 2013 Elsevier Ltd. All rights reserved.