o-TOLUIDINE CAS N°: 95-53-4 - UNEP Chemicals

OECD SIDS o-TOLUIDINE
Table 3 Photodegradation of o-toluidine (IUCLID 3.1.1)
Parameter Method Result Reference IUCLID
Indirect
photodegradation in
air
2.2.3 Stability in Water
Calculation with AOPWIN,
v. 1.91 for 24 h-day,
500 000 OH/cm 3
t1/2 = 2.9 h Bayer
AG, 2003
o-Toluidine is not expected to undergo hydrolysis in the environment due to the lack of
hydrolysable functional groups (Harris, 1990).
2.2.4 Transport between Environmental Compartments
The distribution of o-toluidine in a “unit world” was calculated according to the Mackay Fugacity
Model Level I (v. 2.11). The main target compartment for o-toluidine is water with 91.81 %
followed by air with 7.82 %. Results and input parameters are presented in Table 4 (Bayer
AG, 2003).
Table 4 Input parameters and results of the Mackay Fugacity Model Level I (IUCLID
3.3.2)
Input Parameters Value
Temperature 25 °C
Vapour Pressure 34.5 Pa
Water Solubility 15 g/l
Log Kow
1.40
Melting Point* -24.4 °C (α-form)
-16.3 °C (β-form)
Compartment Calculated distribution
Water 91.81 %
Air 7.82 %
Sediment 0.18 %
Soil 0.18 %
Suspended Sediment < 0.01 %
Aerosol < 0.01 %
Fish < 0.01 %
*: both melting point values led to the same results
Altschuh et al. (1999) measured the Henry´s law constant (HLC) at 25 °C with the thermodynamic
method and HPLC/GC. The method consisted in using a concentration of o-toluidine of 200 mg/l.
The pure substance was dissolved in demineralized distilled water in 5 experimental runs. The
dimensionless HLC is reported to be 0.000081, which corresponds to 0.2 Pa m 3 /mol.
3.1.1
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