Registration Dossier
Registration Dossier
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EC number: 205-286-2 | CAS number: 137-26-8
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:
- key study
- Study period:
- 30 March 1999
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Calculated using AOPWIN v3.1, a subroutine of the computer program EPI Suite™ (Estimation Program Interface for Windows, version 4.0. Syracuse Research Corporation, Syracuse, NY, USA) U.S. Environmental Protection Agency, OPPT
- GLP compliance:
- no
- Estimation method (if used):
- The half-life of Thiram in air due to indirect photodegradation, i.e. oxidation with photochemically produced hydroxyl radicals, was calculated using the software program AOPWIN (Atmospheric Oxidation Programme for Microsoft Windows 3.1, June 1995).
- DT50:
- 21.3 min
Reference
Calculated degradation rate: 362.0592 x 10-12cm3x molecule-1x s-1.
Thiram degrades rapidly in the atmosphere with the DT50 value of 21.3 minutes. As the active ingredient contains no carbon-carbon double and triple bonds, Thiram is not supposed to react with ozone. Due to the short chemical lifetime of Thiram in air and the fact that Thiram is only slightly volatile (vapour pressure = 2.3 x 10-3 Pa) it is not to be expected that the compound will accumulate in air or be transported in the gaseous phase over long distances. Hence, air will not be an environmental compartment of concern.
Description of key information
Tetramethylthiuram disulfide (CAS No. 137-26-8) photodegrades rapidly in air (DT50 = 21.3 minutes, QSAR).
Key value for chemical safety assessment
Additional information
The dissipation half-life of tetramethylthiuram disulfide (CAS No. 137-26-8) in air due to indirect degradation was estimated in a study. This value was calculated using the AOPWIN subroutine from EPISuite™ computer program (US EPA), resulting in a half-life of 21.3 minutes. Tetramethylthiuram disulfide degrades rapidly in the atmosphere and it is not expected to react with ozone (no carbon-carbon double or triple bonds in the active ingredient) or be transported through long distances in the atmosphere.
Therefore, air is not considered as an environmental compartment of concern for this substance.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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