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EC number: 204-385-8 | CAS number: 120-32-1
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
DT50 (photolysis): 0.7 hour (OECD proposal, 2000; Meinerling and Herrmann, 2007)
Key value for chemical safety assessment
Additional information
A study on photolysis of Chlorophene (CAS 120-32-1) in water was conducted by Meinerling and Herrmann (2007). The test was performed according to “OECD Proposal for a new guideline, Phototransformation of Chemicals in Water – Direct and Indirect Photolysis, August 2000”. Chlorophene was incubated in aqueous buffer solution (pH 7) at a concentration of 5 mg/L over a time interval of 5 days (first experiment) and 4 hours (second experiment). The temperature during the study was maintained within the range of 20 to 30 °C. For technical reasons, the temperature during the first experiment was > 30 °C. Samples were either kept in the dark or exposed to a filtered xenon arc lamp. Residues of chlorophene were analysed by HPLC. Chlorophene concentration rapidly dropped from an initial value of 99.4% to 0% of applied dose after 48 hours in the 5 days experiment and from an initial value of 99.7% to a low value of 4.3% of applied dose by 4 hours in the 4 hours experiment. Under non-irradiated conditions, the mean parent concentration is not significantly reduced. The aqueous photolysis half-life of chlorophene was calculated to be 0.7 hours.Therefore, photolysis will contribute to the overall degradation of chlorophene in aquatic systems.
Photodecomposition of chlorophene in water
Guideline Test method |
Initial TS concentration |
pH value of the medium |
Photolysis rate constant (kcp) |
Direct photolysis sunlight rate constant (kpE) |
Reaction quantum yield (fcE) |
Half-life (DT50) |
Degra-dation products |
Reference |
OECD 2000* |
5 mg a.s./L |
7 |
0.98 [1/h] |
11.97 [1/day]. |
Not |
0.7 h (experi-mental) |
Not determined |
Meinerling and Herrmann, 2007 |
*OECD Proposal for a new Guideline, Phototransformation of Chemicals in Water – Direct and Indirect Photolysis, August 2000
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