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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Phototransformation in soil

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Administrative data

phototransformation in soil
Type of information:
other: Technical discussion
Adequacy of study:
supporting study
Study period:
Not available
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well documented discussion on substance properties

Data source

Referenceopen allclose all

Reference Type:
Rates of direct photolysis in the aqueous environment
Zepp, R., Cline, D.
Bibliographic source:
Environmental Science and Technology 11: 359-366
Reference Type:
review article or handbook
Chapter 8. Rate of aqueous photolysis
Harris, J.C.
Bibliographic source:
In: "Handbook of chemical property estimation methods", Lyman, W.J., Reehl, W.F., Rosenblatt, D.H., eds. McGraw-Hill Book Company, New York, USA
Reference Type:
review article or handbook
Handbook of property estimation methods for chemicals
Boethling, R., Mackay, D.
Bibliographic source:
CRC Press, Boca Raton, FL, USA. CRC Press, Boca Raton, FL, USA

Materials and methods

Test guideline
no guideline followed
Principles of method if other than guideline:
Technical discussion

Test material

Constituent 1
Chemical structure
Reference substance name:
Hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, aromatics (2-25%)
EC Number:
Molecular formula:
None available- not a single isomer
Hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, aromatics (2-25%)

Results and discussion

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
The substance does not exhibit any potential to undergo phototransformation in soil.
Executive summary:

The direct photolysis of an organic molecule occurs when it absorbs sufficient light energy to result in a structural transformation. The absorption of light in the ultra violet (UV) -visible range, 110-750 nm, can result in the electronic excitation of an organic molecule. The stratospheric ozone layer prevents UV light of less than 290 nm from reaching the earth's surface. Therefore, only light at wavelengths between 290 and 750 nm can result in photochemical transformations in the environment.

A conservative approach to estimating a photochemical degradation rate is to assume that degradation will occur in proportion to the amount of light wavelengths >290 nm absorbed by the molecule. Hydrocarbons, C9-C14, n-alkanes, isoalkanes, cyclics, contains hydrocarbon molecules that absorb UV light below 290 nm, a range of UV light that does not reach the earth's surface. Therefore, this substance does not have the potential to undergo photolysis in water and soil, and this fate process will not contribute to a measurable degradative loss of this substance from the environment.