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

OECD SIDS o-TOLUIDINE
3. ENVIRONMENTAL FATE AND PATHWAYS ID: 95-53-4
DATE: 07.01.2005
Result : Koc = 74
Reliability : (2) valid with restrictions
Accepted calculation method
Flag : Critical study for SIDS endpoint
14.06.2004 (26)
Media : water - sediment
Method : other (measurement)
Year : 2001
Result : Retardation factor (exp.) = 1.06
Adsorption coefficient (Kd) = 0.013
Average capacity factor (n=5 replicates) = -0.23
As Koc = Kd/Foc and the mean Foc (fraction of organic carbon content)
was ca. 0.015, the Koc can be calculated to 0.87.
Test condition : - Columns (length = 2 m, i.d. = 74 mm) were filled with cored material from
the aquifer near Torgau (Germany) and sieved to a size fraction < 1 mm.
- The organic carbon content of the sediment material was 0.01 to 0.02 %
and the iron and manganese content were approx. 3 and 0.02 g/kg,
respectively.
- Main component of the material was quartz.
- Effective porosity of 0.37 and average solid bulk density of dry solids of
1.7 g/cm3.
- River Elbe water (pH 7.5 to 7.8) spiked with 6 to 30 µg/l of each amine
was pumped through the column at a rate of 1.5 to 2.5 ml/min. After
passing through the column the water was sampled in fractions, enriched
by a factor of 100 and analyzed by HPLC-DAD.
Test substance : Group of aromatic amines including o-toluidine (Aldrich, purity > 97 %)
Reliability : (2) valid with restrictions
Study meets generally accepted scientific principles
Flag : Critical study for SIDS endpoint
18.06.2004 (54) (69)
Media : water - soil
Method : other (calculation): application of TGD Koc-formula for anilines
Year : 2003
Result : Using a Kow of 1.4 and the TGD equation for anilines:
log Koc = 0.62 log Kow + 0.85 = 1.72
a Koc = 52 can be calculated.
Reliability : (2) valid with restrictions
Accepted calculation method
Flag : Critical study for SIDS endpoint
14.06.2004 (26)
Media : water - soil
Method : other (measurement)
Year : 1992
Method : Adsorption experiments with o-toluidine on Ca2+- and K+-saturated
Wyoming bentonite (SWy-1) were performed under conditions of varied pH
and ionic environment.
Remark : Organic amine adsorption on bentonite is pH dependent.
Result : Adsorption increased as pH decreased from approx. pH 7, with an
adsorption maximum occurring when solution pH is approx. equal to the
pKa of the anilinium ion deprotonation reaction. The pKa of o-toluidine is
about 4.45.
Maximum amine adsorption is greater in the Ca2+ systems than in the K+
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