Registration Dossier
Registration Dossier
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EC number: 206-354-4 | CAS number: 330-54-1
Phototransformation in air
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in air
- Type of information:
- calculation (if not (Q)SAR)
- Remarks:
- Migrated phrase: estimated by calculation
- Adequacy of study:
- other information
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Guideline calculation method
- Qualifier:
- no guideline required
- Principles of method if other than guideline:
- Model calculation was performed according to the Atkinson estimation method of the vapour phase reaction rate with hydroxyl radicals (kOH) as proposed by Atkinson in Environmental Toxicology and Chemistry, volume / (1988), pp 435-442
- GLP compliance:
- no
- Remarks:
- not applicable
- Executive summary:
In order to determine the atmospheric half-life of Diuron, a calculation based on the Atkinson estimation method was used and the Atmospheric Oxidative Program was also used. A half-life of 2.9 to 3.1 hours was determined indicating a rapid disappearance of Diuron in air.
Reference
The photochemical oxidative degradation of Diuron in air was determined based on molecular structure and the reaction rate constant with OH radicals (kOH), to be 122.87 x 10-12cm3.molecule-1.sec-1.
Assuming hydroxyl radicals (OH) to be 5 x 105molecules.cm-3, the degradation half-life of Diuron was estimated to be 3.1 hours assuming a moderate OH concentration in the air. A chemical half-life of 4.5 hours is estimated.
The Atmospheric Oxidative Program was also used to determine the half-life in air of Diuron. With a reaction rate constant of 132.16 x 10-12, a half-life of 2.9 hours was calculated.
Description of key information
A half-life of 2.9 to 3.1 h indicates that Diuron will disappear rapidly in air
Key value for chemical safety assessment
Additional information
In order to determine the atmospheric half-life of Diuron, a calculation based on the Atkinson estimation method was used and the Atmospheric Oxidative Program was also used (hellpointner, 1991). A half-life was determined of 2.9 to 3.1 h indicating a rapid disappearance on Diuron in air.
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