Registration Dossier

Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Original reference not available; reliability 2 according to OECD SIDS

Data source

Referenceopen allclose all

Reference Type:
secondary source
Title:
o-TOLUIDINE CAS No: 95-53-4 SIDS Initial Assessment Report.
Author:
OECD
Year:
2005
Bibliographic source:
UNEP Publications
Reference Type:
publication
Title:
Structure-activity relations for the photodegradation reactions of monosubstituted anilines in TiO2 suspensions
Author:
San N and Cunar Z
Year:
2002
Bibliographic source:
.J. Adv. Oxid. Technol. 5 (1), 85-92

Materials and methods

Study type:
indirect photolysis
Principles of method if other than guideline:
other (measured): TiO2 and UV-light as a waste water remediation system (OECD SIDS)
Indirect photodegradation in aqueous TiO2 suspension.
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
o-toluidine
EC Number:
202-429-0
EC Name:
o-toluidine
Cas Number:
95-53-4
Molecular formula:
C7H9N
IUPAC Name:
o-toluidine
Details on test material:
Several anilines including o-toluidine, reagent grade (OECD SIDS)

Study design

Light source:
other: blacklight fluorescent lamps, 40 W in total
Sensitiser (for indirect photolysis)
Type of sensitiser:
other: TiO2 (anatase from Degussa (type P25) with 30 nm particle size and a surface area of 50 m2/g)
Duration of test at given test condition
Duration:
3 h
Temp.:
25 °C
Initial conc. measured:
10.7 mg/L

Results and discussion

% Degradationopen allclose all
Test condition:
Indirect photolysis
% Degr.:
50
Sampling time:
4.2 h

Any other information on results incl. tables

OECD SIDS:
A degradation rate constant (k) of 2.75E-03 (1/min) was
determined for o-toluidine.
Results indicate that the photocatalytic degradation of
o-toluidine in aqueous TiO2 suspensions can be described by
a first order kinetic equation model.
Based on this equation a t1/2 of 252 min could be calculated.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Executive summary:

The kinetics of the photocatalytic degradation reactions of nine different monosubstituted anilines including o-toluidine was studied in liquid phase. The experiments were carried out in a batch-type photoreactor provided with black light fluorescent lamps (UV, mostly near 360 nm). The incident light intensity was measured by means of a potassium ferrioxalate actinometer. Results indicate that the photocatalytic degradation of o-toluidine in aqueous TiO2 suspension can be described by the first order kinetic model lnC = -kt+lnCo, where Co is the initial concentration and C the concentration at time t. A degradation rate constant of 2.75×10-3 min-1 for o-toluidine was determined. Therefore a half-life value of o-toluidine of 4.2 h can be calculated.