Registration Dossier

Administrative data

Endpoint:
phototransformation in air
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Study period:
Prior to or in 2001
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Published literature
Justification for type of information:
Read across is based on the category approach. Please refer to attached category document.
Cross-reference
Reason / purpose:
reference to other study

Data source

Reference
Reference Type:
publication
Title:
Computer estimation of the atmospheric gas-phase reaction rate of organic compounds with hydroxyl radicals and ozone
Author:
Meylan and Howard
Year:
1993
Bibliographic source:
Chemosphere 36:2293-99.

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: Calculated using AOPWIN v. 1.92
Deviations:
not specified
Principles of method if other than guideline:
Estimation of second-order reaction rate constant with photochemically-generated hydroxyl radical at 25 °C. Estimated half-life calculated for assumed OH radical concentration of 1.5E06 OH/cm3
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
No test material used. Method is a computer program, using SMILES code entry.
SMILES Code: O(CCOCCOCCO)CCO
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
Not applicable

Study design

Estimation method (if used):
Calculated using Aopwin v. 1.92, as in cited Reference, for assumed atmospheric OH concentration of 1.5E06 OH/cm3 at 25 °C.
Light source:
sunlight
Details on test conditions:
Estimated rate constant at 25 °C, assumed OH radical concentration of 1.5E06 OH/cm3.

Results and discussion

Preliminary study:
Not applicable
Test performance:
Half-life t ½ :2.5 hours.
Dissipation half-life of parent compound
DT50:
2.5 h
Test condition:
25 °C, background OH radical concentration of 1.5E06 OH/cm3
Transformation products:
not measured
Results with reference substance:
not applicable

Any other information on results incl. tables

Direct photolysis: 

Half-life t ½ : 2.5 hrs.

Remarks: Estimation for photo-oxidation in air based on a calculated reaction rate constant of 5.037 x 10-11cm3/molecules-sec, and background OH radical concentration of 1.5E6 OH/cm3 at 25 °C.

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
Half-life t ½ : 2.5 hrs. at 25 °C and assumed backgroung OH radical concentration of 1.5E6 OH/cm3.
Executive summary:

The photodegradation potential of tetraethylene glycol was examined using Aopwin v. 1.92, as described in cited Reference, for an atmospheric OH concentration of 1.5E6 OH/cm3. The Half-life t½ of 2.5 hrs. was calculated.