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EC number: 271-091-4
CAS number: 68515-49-1
Di-isodecyl phthalate ester (DIDP; CAS #68515-49-1) does not absorb light within a range of 290 to 750 nm. Therefore, direct photolysis will not contribute to the degradation of DIDP in the aquatic environment because it does not absorb light at wavelengths >290 nm, i.e., in the range that contributes to this process.
Direct photochemical degradation in
water occurs through the absorbance of solar radiation by a chemical
substance. If the absorbed energy is high enough, then, in the resultant
excited state, the chemical may undergo a transformation. A prerequisite
for direct photodegradation is the ability of one or more bonds within a
molecule to absorb ultraviolet (UV)/visible light in the 290 to 750 nm
range. Light wavelengths longer than 750 nm do not contain sufficient
energy to break chemical bonds, and wavelengths below 290 nm are
shielded from the earth by the stratospheric ozone layer. An approach to
assessing the potential for di-isodecyl phthalate ester (DIDP;
CAS #68515-49-1) to undergo direct photochemical degradation is to
assume that degradation will occur in proportion to the amount of light
wavelengths >290 nm absorbed by DIDP molecules. DIDP does not absorb
light within a range of 290 to 750 nm. Therefore, direct
photolysis will not contribute to the degradation of DIDP in the aquatic
environment because it does not absorb light at wavelengths >290 nm,
i.e., in the range that contributes to this process.
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