Registration Dossier
Registration Dossier
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EC number: 204-385-8 | CAS number: 120-32-1
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
DT50 = 21.664 h (AOPWIN, v. 1.91, 2000 by U.S.-EPA based upon QSAR methods)
Key value for chemical safety assessment
Additional information
The half-life of Chlorophene (CAS 120-32-1) in air due to indirect photodegradation, i.e. oxidation with photochemically produced hydroxyl radicals, was calculated using the software programme AOPWIN, v. 1.91, 2000 by U.S.-EPA based upon QSAR methods developed by Dr. Roger Atkinson and co-workers. AOPWIN requires only a chemical structure to make these predictions. Structures are entered into AOPWIN by SMILES (Simplified Molecular Input Line Entry System) notations.
With the improved version 1.91, the half-life of chlorophene in the troposphere was calculated to be 21.664 hours with a degradation rate of 17.774E-12 cm3 * molecule-1 * s-1. These estimations were carried out with respect to the OH radical reaction, only, and using a 24-hours-day with 5 x 105 OH radicals/cm3 (Fàbregas, 2005).
Based on the vapour pressure and the Henry’s Law constant (calculated, 3.7 x 10-3 Pa m³/mol), no significant volatilisation of chlorophene is to be expected. Calculations of the chemical lifetime in the troposphere resulted in a half life of 21.664 hours. According to these results (DT50 < 2 days), Chlorophene is rapidly degraded by photochemical processes and no accumulation of chlorophene in the air is to be expected.
Stability of chlorophene in air
Type of test |
Method |
Results |
Reference |
Indirect photodegradation |
QSAR-calculation, AOPWIN, v. 1.91, 2000 |
DT50 = 21.664 hours 24h-average OH-conc.: 0.5 x 106 per cm³ |
Fàbregas (2005) |
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