Registration Dossier

Environmental fate & pathways

Phototransformation in air

Currently viewing:

Administrative data

Endpoint:
phototransformation in air
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Meets generally accepted scientific standards, well documented an reliable for assessment.

Data source

Referenceopen allclose all

Reference Type:
publication
Title:
Atmospheric chemistry of aniline, N,N-dimethylaniline, pyridine, 1,3,5-triazine and nitrobenzene
Author:
Atkinson R. et al.
Year:
1987
Bibliographic source:
Environ Sci Technol 21: 64-72
Reference Type:
secondary source
Title:
European Union Risk Assessment Report, Nitrobenzene, CAS No: 98-95-3
Author:
European Chemicals Bureau
Year:
2007
Bibliographic source:
3rd Priority List, Volume: 77

Materials and methods

Principles of method if other than guideline:
Nitrobenzene was irradiated in a Teflon-chamber with a Xenon lamp.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Nitrobenzene

Study design

Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 500000
- Degradation rate constant: 0.7E-12 cm³/molecule*sec
- Temperature for which rate constant was calculated: ca. 23°C
Light source:
Xenon lamp
Light spectrum: wavelength in nm:
> 290
Duration of test at given test condition
Temp.:
23 °C
Initial conc. measured:
0.005 mg/L

Results and discussion

Dissipation half-life of parent compound
DT50:
> 23 d

Any other information on results incl. tables

In this experimental system no decay of nitrobenzene was observed outside of the analytical uncertainties. Hence, the upper limit of the reaction rate constant was determined to be 7E-13 cm3/(molecules.sec). Given an OH-concentration of 5E+05 molecules.cm-3 this leads to an atmospheric half-life of more than 23 days.For calculation of half-life, a 24 hour day was assumed.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
After evaporation or exposure to the air, the substance will be slowly degraded by photochemical processes.