Registration Dossier
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EC number: 201-993-5 | CAS number: 90-43-7
Phototransformation in water
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP guideline study
- Study type:
- direct photolysis
- Qualifier:
- according to guideline
- Guideline:
- other: Pesticide Assessment Guidelines, Subdivision N, Environmental Fate, US EPA, 162-1: Aqueous Photolysis Studies, 1982
- Qualifier:
- according to guideline
- Guideline:
- other: Guidelines for registration of pesticides in Canada PMRA, DACO No. 8.2.3.3.2.
- GLP compliance:
- yes (incl. QA statement)
- Radiolabelling:
- yes
- Light source:
- Xenon lamp
- Light spectrum: wavelength in nm:
- < 290
- Duration:
- 7 d
- Temp.:
- 25 °C
- Initial conc. measured:
- 1 mg/L
- DT50:
- 0.3 d
- Test condition:
- direct photolysis
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP study but method considered valid
- Study type:
- other: direct and indirect
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Experiment was mainly performed as described in the literature:
1. Leifer, A. (1988): The Kinetics of Environmental Aquatic Photochemistry. American Chemical Society, Washington, DC, USA
2. Haag, W. and Hoigné J. (1986): Environ. Sci. Technol., 20, pp. 341-348 - GLP compliance:
- no
- Radiolabelling:
- no
- Light source:
- sunlight
- Details on test conditions:
- To investigate the direct and indirect photolysis of OPP in lake water from a contaminated site near Boston (Halls Brook Holding Area, Woburn, MA, USA) tests were performed
- DT50:
- 4.6 - 5.3 d
- Validity criteria fulfilled:
- not specified
Referenceopen allclose all
Description of key information
Key value for chemical safety assessment
Additional information
Photolysis of OPP (CAS-No. 90-43-7) in water was investigated in two phototransformation studies conducted by Heinemann (2005) and Wick and Gschwend (1998). The first study on photolysis of OPP in water conducted by Heinemann, follows several current standard methods (US-EPA Series 161-2, Canadian and SETAC guidelines). OPP is rapidly photodegraded (experimental DT50 = 0.3 days). In the other study the photodegradation rates of OPP under natural sun light in pure and contaminated lake water showed DT50 values of 5.3 and 4.6 days, respectively).
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