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EC number: 271-089-3
CAS number: 68515-47-9
Conclusion (direct photodegradation - water): Direct photolysis will not contribute to the degradation of DTDP in the aquatic environment because it does not absorb light at wavelengths >290 nm, i.e., in the range that contribute 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 DTDP to undergo direct
photochemical degradation is to assume that degradation will occur in
proportion to the amount of light wavelengths >290 nm absorbed by DTDP
molecules (Zepp and Cline, 1977). DTDP does not absorb light within a
range of 290 to 750 nm.
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