Registration Dossier

Administrative data

Endpoint:
phototransformation in air
Type of information:
(Q)SAR
Adequacy of study:
key study
Study period:
7 July 1993 - 28 September 1994
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1995
Report Date:
1995

Materials and methods

Test guideline
Qualifier:
no guideline followed
Version / remarks:
QSAR developed by Atkinson
Principles of method if other than guideline:
Estimates of the rate constant and half-life for the atmospheric gas-phase reaction between the test substance and hydroxyl radicals were obtained using the structure-activity relationships developed by Atkinson.
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder

Study design

Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 1.5E+06 cm-3
- Degradation rate constant: 137E-12 cm3/molecule-sec
- Computer programme: 'The Atmospheric Oxidation Program'

Results and discussion

Dissipation half-life of parent compound
Key result
DT50:
56 min
Test condition:
Estimated value
Degradation rate constant
Key result
Reaction with:
OH radicals
Rate constant:
0 cm³ molecule-1 s-1
Remarks on result:
other: Estimated value

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
Simazine has been estimated to have a hydroxyl radical rate constant of 1.37E-10 cm3/ molecule-sec and a half-life of 56 minutes.