The organic substances database manual state that "the kOH is multiplied with the [OH]" ([OH]=1,5E6 molecules/cm3 per 12 hrs daylight). Does that mean that the kDegA (s-1) is calculated by taking the estimated (when no experimental data are available) overall OH rate constant (cm3/molecule-sec) times the [OH] as it is (i.e. radical formation only during daylight and assuming a 12 hrs daylight period) or should the calculation extrapolate the 12-hrs OH-concentration to a 24 hrs day? If so, how should that be done?
Many thanks in advance,