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EC number: 203-398-6
CAS number: 106-44-5
K[OH] = 4.7 [10E-11 cm3 molecule-1 s-1]
K[NO3] = 1.07 [10E-11 cm3 molecule-1 s-1]
K[O3] = 4.7 [10E-19 cm3 molecule-1 s-1]
The tropospheric half-life of p-cresol is approximately 8 h due to
degradation by OH radicals with an average concentration of 500000
kOH = 2.21 x 10E-12 exp[(943+-449)/T] cm3 molec.-1 s-1 for a temperature range of 301-373 K
With a OH radical concentration of 1 000 000 molec cm-3 and
a temperature of 301 K, the half-life is 3.8 h
A half-life of 3.8 h is calculated for p-cresol from smoke chamber
experiments at different tempertures.
The tropospheric half-life of p-cresol is approximately 8 h due to degradation by OH radicals with an average concentration of 500000 radicals/mL .An even shorter half-life of 3.8 h at 23°C is calculated for p-cresol from smoke chamber experiment at different tempertures.
In the atmosphere, p-cresol will react with photochemically produced
hydroxyl-radicals. In his critical review Atkinson recommended values
for the reaction constant kOH at room temperature of 4.7 x 10-11 cm³ x
molecule-per second. Based on a tropospheric OH radical concentration of
5 x 105molecules per cm³ a corresponding half-life of 8.0 h
can be calculated.
In an experiment the temperature dependency of the reaction constants in
a smog chamber was determined. The calculated half-life is 3.8 h for
p-cresol at 23°C.
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