Registration Dossier
Registration Dossier
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EC number: 201-126-0 | CAS number: 78-59-1
Phototransformation in water
Administrative data
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Study period:
- approx. 1987
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: No standard test procedure, but in accordance with generally accepted scientific standards and described in sufficient detail
Data source
Reference
- Reference Type:
- publication
- Title:
- Photocatalysed oxidation of toxic organics
- Author:
- Borup MB and Middlebrooks EJ
- Year:
- 1 987
- Bibliographic source:
- Water Sci. Technol. 19, 381-390
Materials and methods
- Study type:
- indirect photolysis
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: Test conditions as reported
- Principles of method if other than guideline:
- UV irradiation induced decomposition of hydrogen peroxide followed by reaction of the resulting OH radicals with the test substance. Relevant parameters were varied and their effect on the removal rate of isophorone was determined.
- GLP compliance:
- not specified
Test material
- Reference substance name:
- Isophorone
- IUPAC Name:
- Isophorone
- Details on test material:
- Isophorone, purity not reported. Initial concentration 62 mg/l
Constituent 1
Study design
- Radiolabelling:
- no
- Analytical method:
- gas chromatography
- Details on sampling:
- Extraction of an aliquot with methylene chloride followed by phase separation
- Buffers:
- no
- Light source:
- other: Low pressure mercury vapor lamp
- Light spectrum: wavelength in nm:
- ca. 254
- Details on light source:
- intensity of UV radiation: approx. 1210 µW/cm2
Sensitiser (for indirect photolysis)
- Type of sensitiser:
- other: hydrogen peroxide
- Concentration of sensitiser:
- 250 mg/L
- Details on test conditions:
- One control without H2O2
One control without UV irradiation
Duration of test at given test condition
- Initial conc. measured:
- 62 mg/L
- Reference substance:
- no
- Dark controls:
- no
Results and discussion
% Degradationopen allclose all
- Test condition:
- Direct photolysis
- % Degr.:
- > 99.9
- Sampling time:
- 60 min
- Test condition:
- Indirect photolysis
- Transformation products:
- not measured
Any other information on results incl. tables
No degradation was observed in controls with H2O2 or UV irradiation alone, respectively. The rate constant varied with intensity of UV radiation. It was first order with respect to H2O2 concentration and zero order with respect to isophorone concentration.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- not applicable
- Conclusions:
- Direct photodecomposition of the test substance was not observed at 254 nm. Indirect photodegradation was complete (> 99.9 %) within 60 minutes. The results are not relevant for environmental conditions.
- Executive summary:
Direct photodecomposition of the test substance was not observed at 254 nm. Indirect photodegradation was complete (> 99.9 %) within 60 minutes. The results are not relevant for environmental conditions.
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