Registration Dossier
Registration Dossier
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EC number: 201-180-5 | CAS number: 79-14-1
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:
- 2 (reliable with restrictions)
- Study type:
- other: direct and indirect photolysis
- Principles of method if other than guideline:
- The photolytic behaviour of glycolic acid was investigated in aqueous solutions. Substrates and sensitisers were dissolved in redistilled water, shaken vigorously with oxygen in a thermostated quartz vessel and irradiated. Reactions were followed for 90 minutes.
- GLP compliance:
- no
- Analytical method:
- other: ferrioxalate actinometry... (see attached file)
- Light source:
- other: medium pressure mercury lamp was used as a surrogate for natural light.
- Duration:
- 90 min
- Temp.:
- 25 °C
- Reference substance:
- no
- Dark controls:
- no
- Transformation products:
- no
- Validity criteria fulfilled:
- no
- Remarks:
- The light source used (i.e. a mercury lamp) is generally accepted not to adequately represent a natural light source.
- Conclusions:
- Photolysis of glycolic acid is not considered to be a significant environmental pathway.
- Executive summary:
The photolytic behaviour of glycolic acid was investigated in aqueous solution. The published non-GLP study was conducted in 1990.
Glycolic acid is not significantly photolysed under artificial sunlight without the aid of a catalyst or sensitizers. Therefore photolysis of glycolic acid is not considered to be a significant environmental pathway.
The light source used (i.e. a mercury lamp) is generally accepted not to adequately represent natural sunlight, therefore the study is presented as supporting information only.
Reference
Description of key information
Key value for chemical safety assessment
Additional information
Although not required, this study is included for completeness. Glycolic acid did not undergo aqueous photolysis in a laboratory study.
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