Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 930-936-3 | CAS number: -
Phototransformation in soil
Administrative data
Link to relevant study record(s)
Description of key information
Phototransformation half-life in soil cannot be determined because the study substance does not absorbed light in the wavelength >290 nm. Therefore, direct photolysis is not expected to contribute to the degradation of the study substance in soil or the terrestrial environment. Hence, a phototransformation half-life in soil is not available for chemical safety assessment.
Key value for chemical safety assessment
Additional information
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 study 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 the study substance molecules. The study substance which is a long-chain alkylated naphthalene does not absorb sufficient light energy above 290 nm to cause photolysis (see JC Harris, “ Rate of aqueous photolysis”, Chapter 8, in Handbook of Chemical Property Estimation Methods (WJ Lyman et al eds.), mcGraw-Hill,(1982). Therefore, direct photolysis will not contribute to the degradation of the study substance in the terrestrial environment because it does not absorb light at wavelengths >290 nm, i.e., in the range that is a requisite to this process in soil.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
