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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1991
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Indirect photolysis study in the presence of catalyzers. Reliable but not relevant for environmental fate assessment.

Data source

Reference
Reference Type:
publication
Title:
Mild oxidation of cyclic C6-C10 hydrocarbons in liquid phase at room temperature by heterogeneous photocatalysis
Author:
Herrmann JM, Mu W and Pichat P
Year:
1991
Bibliographic source:
Stud. Surf. Sci. Catal. 59, 405-412

Materials and methods

Study type:
indirect photolysis
Principles of method if other than guideline:
UV ilumination of TiO2 suspension
GLP compliance:
no

Test material

Constituent 1
Reference substance name:
Decalin
IUPAC Name:
Decalin
Details on test material:
cis-decahydronaphthalene from Aldrich, trans-decahydronaphthalene of unknown origin. No data on purity. Employed as received

Study design

Radiolabelling:
no
Analytical method:
gas chromatography
Buffers:
none
Light source:
other: mercury lamp
Light spectrum: wavelength in nm:
> 300
Details on light source:
Philips HPK 125 W mercury lamp, radiant flux measured with calibrated radiometer (United Technology, model 21 A)
Sensitiser (for indirect photolysis)
Type of sensitiser:
other: TiO2
Details on sensitiser:
suspended in 10 ml test material
Details on test conditions:
Apparatus: Cylindrical static slurry photoreactor of 90 cm3 with bottom optical window of approx. 4 cm in diameter transmitting wavelengths > 300 nm.
Temperature: Room temperature
Reference substance:
no
Dark controls:
no

Results and discussion

Rate constant (for indirect photolysis):
other: not measured
Transformation products:
yes
Identity of transformation productsopen allclose all
No.:
#1
Reference
Reference substance name:
Unnamed
IUPAC name:
2-Decalone
Identifier:
common name
Identity:
2-Decalone
No.:
#2
Reference
Reference substance name:
Unnamed
IUPAC name:
1-Decalone
Identifier:
common name
Identity:
1-Decalone
No.:
#3
Reference
Reference substance name:
Unnamed
IUPAC name:
2-Decalol
Identifier:
common name
Identity:
2-Decalol
No.:
#4
Reference
Reference substance name:
Unnamed
Inventory number:
InventoryMultipleMappingImpl [inventoryEntryValue=EC 204-696-9]
Details on results:
The cis isomer was found at least 10 times more reactive with a selectvitiy of 81 % in mild oxidation products and 19 % in CO2. The relative concentrations of the non-CO2 oxidation products were 86 (#1) : 7 (#2) : 7 (#3). The preferential attack at position 2 could be due to the steric mode of  adsorption of cis-decahydronaphthalene at the TiO2 surface.

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
Decahydronaphthalene was photodegraded in presence of TiO2 to 2-decalone (main product), 1-decalone and 2-decalol as well as some carbon dioxide. Half-life was not estimated. The cis isomer was at least 10 times more reactive than the trans isomer.
Executive summary:

Decahydronaphthalene was photodegraded in presence of TiO2 to 2-decalone (main product), 1-decalone and 2-decalol as well as some carbon dioxide. Half-life was not estimated. The cis isomer was at least 10 times more reactive than the trans isomer