Registration Dossier

Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
other information
Study period:
2002
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: sufficiently documented publication

Data source

Reference
Reference Type:
publication
Title:
Degradation of chlorinated benzaldhydes in aqueous solutions by UV-irradiation
Author:
Bekbölet, M. and Getoff, N.
Year:
2002
Bibliographic source:
Turk. International Journal of Photoenergy 4(4), 133-139

Materials and methods

Study type:
indirect photolysis
Principles of method if other than guideline:
Photoinduced degradation of chlorinated benzaldehydes was investigated using monochromatic UV light with λ = 253.7 nm in aerated aqueous solutions.

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
2-chlorobenzaldehyde was received from commercial sources in p.a. quality.

Study design

Radiolabelling:
no
Analytical method:
high-performance liquid chromatography
other: Spectrophotometer
Light source:
other: low pressure mercury lamp with Vycor-filter
Light spectrum: wavelength in nm:
253.7
Duration of test at given test condition
Temp.:
31.5 °C
Initial conc. measured:
0.1 mmol/L

Results and discussion

Rate constant (for indirect photolysis):
7.45 other: x10^(-3)/min
Transformation products:
yes
Identity of transformation productsopen allclose all
No.:
#1
Reference
Reference substance name:
Unnamed
Inventory number:
InventoryMultipleMappingImpl [inventoryEntryValue=EC 231-595-7]
IUPAC name:
chloride
CAS number:
7647-01-0
No.:
#2
Reference
Reference substance name:
Unnamed
Inventory number:
InventoryMultipleMappingImpl [inventoryEntryValue=EC 200-001-8]
IUPAC name:
formaldehyde
Identity:
Formaldehyde
CAS number:
50-00-0
Molecular formula:
CH2O
Molecular weight:
30.026
SMILES notation:
C=O
InChl:
InChI=1/CH2O/c1-2/h1H2

Any other information on results incl. tables

Substrate degradation rate as revealed by first order kinetics: K=7.45x10-3/min;

Light intensity under the experimental conditions: I0 = 6.44 x 1016 h*v*mL-1min-1 for a optical path lenght of 1.0 cm.

During the photolysis of the chlorobenzaldehydes a strong pH-decrease was also observed, resulting from the formation of organic acids in addition to the Cl ions.

Applicant's summary and conclusion