N-(1,3-Dimethylbutyl)-N

OECD SIDS
N-(1,3-DIMETHYLBUTYL)-N´-PHENYL-1,4-PHENYLENEDIAMINE
3. ENVIRONMENTAL FATE AND PATHWAYS ID: 793-24-8
DATE: 11.05.2005
ADPA concentration except in nutrient solution (test 3) when it was 31 %
Test condition : The following test conditions (all at 50 °C) were investigated:
- Test 1: Test performed in buffer solution pH 7, air saturated. The
Erlenmeyer flask was irradiated with a lamp at 8000 lux.
- Test 2: Test performed in buffer solution pH 7, air saturated. The
Erlenmeyer flask was kept dark by enclosure with alumina foil.
- Test 3: Prior to the test the nutrient medium (algal inhibition test) was
incubated at 130 °C for 16 hours in an autoclave in order to obtain nearly
sterile conditions. The test solution (nutrient medium) and the head space
were air saturated. The Erlenmeyer flask was irradiated with a lamp at
8000 lux.
- Test 4: Test performed in buffer solution pH 7, anaerobic. The Erlenmeyer
flask was kept dark by enclosure with alumina foil.
- Test concentration 100 mg/l 4-ADPA
Reliability : (2) valid with restrictions
Comparable to guideline study with acceptable restrictions
Flag : Critical study for SIDS endpoint
03.11.2004 (33)
Type : Abiotic
t1/2 pH4 : 75 day(s) at 25 °C
t1/2 pH7 : 42 day(s) at 25 °C
t1/2 pH9 : at °C
Deg. product : Yes
Method : Directive 92/69/EEC, C.7
Year : 2002
GLP : Yes
Test substance : other TS: 4-ADPA, 99.18 % purity
Method : Comparable to test guideline OECD 111
Concentration used was 0.1 mmol/l (= 18.4 mg/l). Although still below limit
of solubility, at 1 mmol/l precipitations were observed (presumably from
degradation products)
Remark : 4-Aminodiphenylamine (4-ADPA) has a structure similar to that of 6PPD,
except that the alkyl group is missing
Result : - At pH 9 the test substance was degraded faster than at pH 4 and 7. At pH
9 the reaction did not show pseudo-first order behaviour and no half live
could be derived for different temperatures according to Arrhenius
equation. The test solution was coloured brown.
- At pH 4 and 7 the test solutions were coloured blue and turquoise,
respectively. At these pH values, the degradation was pseudo-first order
reaction.
Half lives of 4-ADPA (h)
Temp pH
(°C) 4 7 9
50 80.3 57.4 5.4
70 18.7 14.9 1.7
85 2.4 2.2 1.0
Arrhenius-Factors for the temperature dependence can be derived from the
above mentioned data and were in the range of 1.42 - 3.93 (average 2.46)
per 10 °C of temperature increase
Test condition : At the start, each assay was treated with argon (according to guideline) to
ensure anaerobic conditions at that time.
All vessels were incubated in the dark.
Analysis: HPLC
Reliability : (1) valid without restriction
Guideline study
Flag : Critical study for SIDS endpoint
03.11.2004 (34)
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