A mixture of isomers of: mono-(2-tetradecyl)naphthalenes; di-(2-tetradecyl)naphthalenes; tri-(2-tetradecyl)naphthalenes

Phototransformation in soil

Administrative data

Endpoint:

phototransformation in soil

Type of information:

other: Technical discussion

Adequacy of study:

key study

Study period:

Not Applicable

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The reliability is rated 2 because the information presents a technical summary rather than the results of a specific study.

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

1977

Report date:

1976

Materials and methods

Test material

Test material information

Constituent 1

Reference substance name:

A mixture of isomers of: mono-(2-tetradecyl)naphthalenes; di-(2-tetradecyl)naphthalenes; tri-(2-tetradecyl)naphthalenes

EC Number:

410-190-0

EC Name:

A mixture of isomers of: mono-(2-tetradecyl)naphthalenes; di-(2-tetradecyl)naphthalenes; tri-(2-tetradecyl)naphthalenes

Cas Number:

132983-41-6

Molecular formula:

Can vary from C24H36 (mono rxn product) to C52H92 (tri rxn product)

IUPAC Name:

2,3,6-tritetradecylnaphthalene; 2,3-ditetradecylnaphthalene; 2-tetradecylnaphthalene

Radiolabelling:

no

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The test substance does not absorb light within a range of 290 to 750 nm. Therefore, direct photolysis will not contribute to the degradation of the test substance in the terrestrial environment because it does not absorb light at wavelengths >290 nm, i.e., in the range that contribute to this process.

Executive summary:

Direct photochemical degradation in soil occurs through the absorbance of solar radiation by a chemical substance. If the absorbed energy is high enough, then, in the resultant excited state, the chemical may undergo a transformation. A prerequisite for direct photodegradation is the ability of one or more bonds within a molecule to absorb ultraviolet (UV)/visible light in the 290 to 750 nm range. Light wavelengths longer than 750 nm do not contain sufficient energy to break chemical bonds, and wavelengths below 290 nm are shielded from the earth by the stratospheric ozone layer. An approach to assessing the potential for the test substance to undergo direct photochemical degradation is to assume that degradation will occur in proportion to the amount of light wavelengths >290 nm absorbed by substance molecules.  The test substance does not absorb light within a range of 290 to 750 nm. Therefore, direct photolysis will not contribute to the degradation of the test substance in the terrestrial environment because it does not absorb light at wavelengths >290 nm, i.e., in the range that contribute to this process.