Registration Dossier
Registration Dossier
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EC number: 203-854-4 | CAS number: 111-29-5
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Buxton et al. (1988) performed a non-guideline test on photodegradation of several chemical substances in water. In this non-guideline study OH-radicals were used as sensitizer. At pH = 9 they found a rate constant for the aquatic photodegradation of 3.6E-09 l/mol/s.
As described by Zepp et al. (1987) for the small lake Greifensee in Switzerland, the OH radical concentration reaches 2.5E-16 mol/l in the summer time at noon near the surface. From this "best case", a half-life in terms of aquatic photolysis of 8.9 days can be calculated for pentane-1,5-diol. The average OH-radical concentration over the whole water column (14 m) over the whole year is 3.0E-18 mol/l. Using this value, an average half-life in terms of aquatic photolysis of ca. 2 years can be calculated.
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