o-toluidine

Phototransformation in water

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

Reference

Reference 1

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 2

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

Test material information

Constituent 1

Reference substance name:

o-toluidine

EC Number:

202-429-0

EC Name:

o-toluidine

Cas Number:

95-53-4

Molecular formula:

C7H9N

IUPAC Name:

2-methylaniline

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

% Degradation

% Degradation 1

Test condition:

Indirect photolysis

% Degradation 2

% 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.