Registration Dossier
Registration Dossier
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EC number: 201-182-6 | CAS number: 79-16-3
Phototransformation in water
Administrative data
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study meets generally accepted scientific principles, acceptable for assessment
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- Sites of Attack of Hydroxyl Radicals on Amides in Aqueous Solution. II. The Effects on Branching alpha to Carbonyl and to Nitrogen.
- Author:
- Hayon E, Ibata T, Lichtin NN and Simic M (1971).
- Year:
- 1 971
- Bibliographic source:
- J Am Chem Soc 93(21): 5388-5394.
- Reference Type:
- publication
- Title:
- Nitrate-induced photooxidation of trace organic chemicals in water.
- Author:
- Zepp RG, Hoigné J and Bader H
- Year:
- 1 987
- Bibliographic source:
- Environ Sci Technol 21: 443-450.
Materials and methods
- Study type:
- indirect photolysis
Test guideline
- Qualifier:
- no guideline followed
- GLP compliance:
- no
Test material
- Reference substance name:
- Reference substance 001
- Details on test material:
- - test substance: N-Methylacetamide
- purity: no data
Constituent 1
Study design
- Analytical method:
- not specified
Sensitiser (for indirect photolysis)
- Type of sensitiser:
- OH radical
- Details on test conditions:
- - source of OH radicals: pulse radiolysis of N2O
- measurement at pH 5-6 under competition with 0.01 M thiocyanate in the presence of 1 atm of N2O
- concentration range: 25-100 mM (1.8-7.31 g/l)
- Rate constant for the reaction of OH radicals with N-methylacetamide in aqueous solution determined by competition with thiocyanate (1.1E10 M-1 s-1): 1.6E9 m-1 s-1
Results and discussion
Dissipation half-life of parent compound
- DT50:
- > 20.1 - < 1 671 d
Any other information on results incl. tables
As described by Zepp et al. (1987) for the small lake Greifensee in Switzerland, the OH radical concentration reaches 2.5E-16 mol/l in the summer time at noon near the surface. From this "best case", a half-life in terms of aquatic photolysis of 20.1 days can be calculated for N-methylacetamide. The average OH-radical concentration over the whole water column (14 m) over the whole year is 3.0E-18 mol/l. From this, a half-life in terms of aquatic photolysis of 4.6 years can be calculated.
Applicant's summary and conclusion
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