Registration Dossier
Registration Dossier
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EC number: 240-815-0 | CAS number: 16752-77-5
Phototransformation in soil
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in soil
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Qualifier:
- according to guideline
- Guideline:
- EPA Guideline Subdivision N 161-3 (Photodegradation Studies on Soil)
- Deviations:
- no
- GLP compliance:
- no
- Specific details on test material used for the study:
- - Substance name: [1-14C]Methomyl
- Lot #: 1800-056
- Purity: Not reported - Radiolabelling:
- yes
- Analytical monitoring:
- yes
- Analytical method:
- high-performance liquid chromatography
- other: LSC, TLC
- Light source:
- sunlight
- Duration:
- 30 d
- Temp.:
- 28 °C
- Initial conc. measured:
- 1 other: lb/a.i. acre
- Reference substance:
- yes
- Dark controls:
- yes
- Key result
- DT50:
- 34 d
- Test condition:
- test substance in soil exposed to natural sunlight
- Transformation products:
- yes
- Remarks:
- Acetonitrile
- Conclusions:
- The test substance decomposed with a half-life of 34 days to form acetonitrile, the only detected radioactive decomposition product
- Executive summary:
The study was conducted according to EPA Guideline 161-3. Radiolabeled [1-14C]test substance was applied evenly (at a rate equivalent to 1 lb/a.i. acre) to a thin layer of keyport silt loam and exposed to natural sunlight for 30 days at a temperature of 24-28°C. Under these conditions, the test substance decomposed with a half-life of 34 days to form acetonitrile, the only detected radioactive decomposition product. Controls kept in the dark did not decompose.
Reference
Description of key information
Study Type |
Study Details | Value | Guideline | Reliability |
| Phototransformation in soil | Applied evenly to keyport silt loam and exposed to natural sunlight |
DT50 = 34 days Decomposition product was acetonitrile |
EPA 161-3 |
2 |
Key value for chemical safety assessment
- Half-life in soil:
- 34 d
Additional information
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