Registration Dossier

Administrative data

Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
secondary literature

Data source

Reference
Reference Type:
secondary source
Title:
Estimation of gas-phase hydroxyl radical rate constants for organic chemicals.
Author:
Atkinson R
Year:
1988
Bibliographic source:
Environ. Tox. Chem., 7:435-442 (cited in BUA (1992). GDGH-Advisory Committee on Existing Chemicals of Environmental Relevance (BUA), Phenylenediamines BUA Report 97 (June), S. Hirzel Verlag, Stuttgart, Germany).

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
The calculation of reactivity versus OH radicals indicates for the test substance a velocity constant of >200E-12 cm3/molecule/second. Assuming a mean tropospheric OH radical concentration of 5E5 molecules/cm3.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Dissipation half-life of parent compound
DT50:
< 2 h
Test condition:
Average tropospheric half-life.

Any other information on results incl. tables

The calculation of reactivity versus OH radicals indicates for the test substance a velocity constant of >200E-12 cm3/molecule/second. Assuming a mean tropospheric OH radical concentration of 5E5 molecules/cm3, the average tropospheric half-life is <2 hours.

Applicant's summary and conclusion

Conclusions:
Average tropospheric half-life is <2 hours
Executive summary:

The calculation of reactivity versus OH radicals indicates for the test substance a velocity constant of >200E-12 cm3/molecule/second. Assuming a mean tropospheric OH radical concentration of 5E5 molecules/cm3, the average tropospheric half-life is <2 hours.