Benzamide, N-[[4-[(cyclopropylamino)carbonyl]phenyl]sulfonyl]-2-methoxy-

Phototransformation in air

Link to relevant study record(s)

Reference

Endpoint:

phototransformation in air

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Validated QSAR model

Justification for type of information:

QSAR prediction: migrated from IUCLID 5.6

Principles of method if other than guideline:

Calculation based on AOPWIN v1.92, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.10. US EPA, United States Environmental Protection Agency, Washington, DC, USA.

GLP compliance:

no

Estimation method (if used):

PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 1.5E6 radicals/cm3
- Degradation rate constant: 32.1097 E-12 cm3/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Computer programme: AOPWIN v1.92

DT50:

4 h

Test condition:

calculation based on a 12 h day

For detailed describtion on the model and its applicability, see "Any other information on materials and methods incl. tables". The estimation is based on a 12 hour day.

Description of key information

 DT50: 4 hours. (QSAR calculation, AOPWIN v1.92) 

Key value for chemical safety assessment

Half-life in air:

4 h

Additional information

Using the effusion method (vapour pressure balance) the vapour pressure for Cyprosulfamide was estimated to be < 0.00001 Pa at 20 °C (OECD 104) indicating that Cyprosulfamide is non-volatile and therefore will not reach the atmospheric compartment of the environment by volatilisation.

The stability in air was estimated by AOPWIN v1.92 based on the increment method of Atkinson for the reaction of an organic molecule with atmospheric hydroxyl radicals. Assuming a mean concentration for the hydroxyl radicals of 1.5E6 radicals/cm³ for 12 hours per day the degradation half-life in air is approximately 4 hours.