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EC number: 929-018-5
CAS number: 129813-66-7
The direct photolysis of an organic molecule
occurs when it absorbs sufficient light energy to result in a structural
transformation. The absorption of light in the ultra violet (UV)-visible
range, 110-750 nm, can result in the electronic excitation of an organic
molecule. The stratospheric ozone layer prevents UV light of less than
290 nm from reaching the earth's surface. Therefore, only light at
wavelengths between 290 and 750 nm can result in photochemical
transformations in the environment.
A conservative approach to estimating a
photochemical degradation rate is to assume that degradation will occur
in proportion to the amount of light wavelengths >290 nm absorbed by the
molecule. Hydrocarbons, C10 -C13, n-alkanes, <2% aromatics contain
hydrocarbon molecules that absorb UV light below 290 nm, a range of UV
light that does not reach the earth's surface. Therefore, these
substances do not have the potential to undergo photolysis in water and
soil, and this fate process will not contribute to a measurable
degradative loss of these substances from the environment.
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