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EC number: 202-163-5
CAS number: 92-52-4
The experimentally-derived second-order rate constant for indirect photolysis with OH radical was determined to be 8.06 (± 0.77) E-12 molecules*cm3-18sec-1 at 294 K (21 °C). This equates to an estimated half-life of 16 hrs. at an assumed OH radical conc. of 1.5E6 molecules/cm3.
The experimentally-derived second-order rate constant for indirect
photolysis with OH radical was determined to be 8.06 (± 0.77) E-12
molecules*cm3-18sec-1 at 294 K (21 °C). This equates to an estimated
half-life of 16 hrs. at an assumed OH radical conc. of 1.5E6
molecules/cm3. The experimental value cited in the AOPWIN v1.92a
software is an arithmetic mean of this Key Study value and various other
reported measurements from the literature. The Key Study also showed
negligible reaction of biphenyl with ozone and nitrate radical, and the
supporting study of Freitag et al. showed negligible reaction under
direct photolysis conditions. Thus, the indirect photolysis with OH
radical is the dominant process affecting fate of biphenyl in the
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