2-chloro-N-[[[4-(trifluoromethoxy)phenyl]amino]carbonyl]benzamide

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Remarks:

Calculation of the Chemical Lifetime of Triflumuron in the Troposphere

Type of information:

other: Modelling report

Adequacy of study:

other information

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference

Reference Type:

other: Modelling report

Title:

Unnamed

Year:

2002

Report date:

2002

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: Federal Biological Institute for Agriculture and Forestry (BBA), Germany: Guidelines for the Testing of Plant Protection Products in Registration Procedure, Part IV, 6-1

Version / remarks:

July 1990

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: EC: Official Journal of the European Communities, No. L 172 (EN), July 22, 95

Test guideline 3

Qualifier:

according to guideline

Guideline:

other: Commission Directive, 95/36/EC, amending Council Directive 91/414/EEC concerning the placing of plant protection products on the market: Annex II, Fate and Behavior in the Environment, 7171/VI/94-EN, 7.2.2.2 Photolysis in Air

GLP compliance:

no

Remarks:

Not applicable (model calculation)

Type of study / information:

Model calculation

Test material

Test material information

1

Reference substance name:

2-chloro-N-[[[4-(trifluoromethoxy)phenyl]amino]carbonyl]benzamide

EC Number:

264-980-3

EC Name:

2-chloro-N-[[[4-(trifluoromethoxy)phenyl]amino]carbonyl]benzamide

Cas Number:

64628-44-0

Molecular formula:

C15H10ClF3N2O3

IUPAC Name:

3-(2-chlorobenzoyl)-1-[4-(trifluoromethoxy)phenyl]urea

Details on test material:

Name of test material in report: Triflumuron
Appearance: Not specified
Batch no.: Not specified
CAS: 64628-44-0
Storage: not specified

Specific details on test material used for the study:

Storage: not specified

Results and discussion

Any other information on results incl. tables

A calculated overall OH reaction rate of 38.1498×10^-12 cm³/molecule-sec is obtained by addition reactions to aromatic rings. Based on this OH rate constant and using a 24-hrs day with 0.5×10⁶ OH radicals/cm³, a half life of triflumuron in air of 0.421 days, corresponding to a chemical lifetime of 0.61 days was assessed. Employing a conservative approach, using only half of the estimated overall OH reaction rate (19 ×10^-12 cm³/molecules-sec), a maximum chemical lifetime of triflumuron in air of 1.2 days is to be expected.
On the account of the chemical lifetime of triflumuron in the air (at the most 1.2 days) it is to be expected that the active substance can not be transported in the gaseous phase over large distances and can not accumulate in the air. Thus, no difference in the behaviour between triflumuron and other organic substances emitted into the air from natural sources (e.g. plants, soil) is indicated.

Applicant's summary and conclusion

Conclusions:

Atkinson calculation of a DT50 of 0.421 days from the EFSA Conclusion corresponds to lifetime of 0.61 days.

The chemical stability of Triflumuron in air is not determined by an attack at one single site, but at different parts of the molecule. This should result in the formation of various primary radicals leading to secondary oxidation products, which can be eliminated from the air by wet and/or dry deposition.
On account of the chemical lifetime of Triflumuron in the air of at the most 1.2 days it is to be expected that the active ingredient can not be transported in gaseous phase over large distances and can not accumulate in the air. Thus, no difference in the behaviour between Triflumuron and other organic substances emitted into the air from natural sources (e.g. from plants, soil) is indicated.

Executive summary:

Based on the calculation according to Atkinson the chemical lifetime of the parent compound Triflumuron in the air is assessed by AOPWIN (version 1.90). A value (τ) of at the most 1.2 days results, with respect to the OH radical reaction, only.
The chemical stability of Triflumuron in air is not determined by an attack at one single site, but at different parts of the molecule. This should result in the formation of various primary radicals leading to secondary oxidation products, which can be eliminated from the air by wet and/or dry deposition.
On account of the chemical lifetime of Triflumuron in the air of at the most 1.2 days it is to be expected that the active ingredient can not be transported in gaseous phase over large distances and can not accumulate in the air. Thus, no difference in the behaviour between Triflumuron and other organic substances emitted into the air from natural sources (e.g. from plants, soil) is indicated.