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Key value for chemical safety assessment

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The SRC AOPWIN program was used to obtain values of the rate constant kOH for reaction of each constituent with hydroxyl radicals. The program outputs are used to calculate a weighted average value for each block based on the modelled composition of ' Paraffin waxes (Fischer–Tropsch), full-range, C15–C50 branched and linear'. The calcuated values are presented in Table xxx of the CSR.

EUSES 2.1.2 calculates an overall half-life in air under default conditions of hydroxyl radical concentration, using the following expressions:

kdegair (d-1) = kOH (cm3/molecule-sec) x OHConcair (molec/cm3) x 24 x 3600

Half-life is then calculated as:

DT50 (d) = ln 2/ kdegair (d-1)


kdegair = total rate constant for degradation in air

kOH = rate constant for reaction with hydroxyl radicals

OHConcair = concentration of hydroxyl radicals in air

DT50 = half-life