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EC number: - | CAS number: -
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
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- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 01 July 2020 to 02 October 2020
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to other study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 111 (Hydrolysis as a Function of pH)
- Version / remarks:
- 2004
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- Version / remarks:
- 2016
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 835.2120 (Hydrolysis of Parent and Degradates as a Function of pH at 25°C)
- Version / remarks:
- 2008
- Deviations:
- no
- GLP compliance:
- yes
- Remarks:
- Date of inspection: 10-17 December 2019 Date on certificate: 24 February 2020
- Analytical monitoring:
- yes
- Buffers:
- Acetate buffer pH 4, 0.01 M: Solution of 16.7% 0.01 M sodium acetate in water and 83.3% 0.01 M acetic acid in water. Buffer contained 0.0009% (w/v) sodium azide.
Phosphate buffer pH 7, 0.01 M: Solution of 0.01 M potassium di-hydrogen-phosphate in water adjusted to pH 7 using 1 M sodium hydroxide. Buffer contained 0.0009% (w/v) sodium azide.
Borate buffer pH 9, 0.01 M: Solution of 0.01 M boric acid in water and 0.01 M potassium chloride in water adjusted to pH 9 using 1 M sodium hydroxide. Buffer contained 0.0009% (w/v) sodium azide - Details on test conditions:
- The rate of hydrolysis of the test item as a function of pH was determined at pH values normally found in the environment (pH 4-9).
Only the results of the measurements at pH 4 are reported. The hydrolysis measurements at pH 7 and at pH 9 were technically not possible due to rapid hydrolysis the test item at these pH values.
All solutions containing the test item were protected from light.
From the initial results obtained in Test Facility Study No. 20194899 (study record cross-referenced) it is observed that degradation/hydrolysis of the reaction product of N-Phenyl-diethanolamine with a single molecule of formaldehyde occurs rapidly and therefore preliminary test has not been performed, but only the main study in a short time period has been performed.
Due to observed rapid degradation/hydrolysis test solutions has been incubated at three temperatures, 10.1°C, 15°C and 20°C until 90% hydrolysis of the substance is observed or for 30 days whichever comes first. Temperatures has been controlled within ± 0.5°C. The concentration of the test item in duplicate test solutions has been determined immediately after preparation and at a minimum of six sampling times afterwards to cover the hydrolysis range of 10% to 90%. Linear regression analysis on the logarithm of the relative concentration between 10% and 90% of hydrolysis and time has been performed to investigate the pseudo-first order behaviour of the test item. During the study only the the reaction product of N-Phenyl-diethanolamine with a single molecule of formaldehyde curve has been made and m/z 212.4 has been quantified in connection with monitoring degradation. - Duration:
- 1.5
- pH:
- 4
- Temp.:
- 20 °C
- Initial conc. measured:
- 4.88 mg/L
- Duration:
- 43.87 h
- pH:
- 4
- Temp.:
- 15 °C
- Initial conc. measured:
- 5.52 mg/L
- Duration:
- 5 h
- pH:
- 4
- Temp.:
- 10 °C
- Initial conc. measured:
- 4.96 mg/L
- Number of replicates:
- 2
- Positive controls:
- no
- Negative controls:
- no
- Preliminary study:
- From the initial results preformed in Test Facility Study No. 20194899 (cross-referenced above) it is observed that degradation/hydrolysis of the test item occurs rapidly and therefore preliminary test has not been performed, but only the main study in a short time period has been performed.
- Test performance:
- At pH 7 and pH 9 it was technically not possible to determine hydrolysis rate due to rapid degradation of the test item at these pH values.
- Transformation products:
- not specified
- Remarks:
- Not identified as part of this study alone but in study number 20194899 it was confirmed that in an aqueous solution the reaction product of N-Phenyl-diethanolamine with a single molecule of formaldehyde is converted back to N-Phenyl-diethanolamine
- % Recovery:
- 98
- pH:
- 4
- Temp.:
- 10 °C
- Duration:
- 5.1 h
- % Recovery:
- 109
- pH:
- 4
- Temp.:
- 15 °C
- Duration:
- 43.87 h
- % Recovery:
- 96
- pH:
- 4
- Temp.:
- 20
- Duration:
- 1.5 h
- pH:
- 4
- Temp.:
- 10 °C
- Hydrolysis rate constant:
- 0.49 h-1
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 4
- Temp.:
- 15 °C
- Hydrolysis rate constant:
- 1.06 h-1
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 4
- Temp.:
- 20 °C
- Hydrolysis rate constant:
- 2.27 h-1
- Type:
- (pseudo-)first order (= half-life)
- Key result
- pH:
- 4
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 4.7 h-1
- Type:
- (pseudo-)first order (= half-life)
- Validity criteria fulfilled:
- yes
- Conclusions:
- The hydrolysis rate of the test item was determined at pH 4 to range from 0.15 hours at 25°C to 1.42 hours at 10°C.
- Executive summary:
Hydrolysis of the test item was investigated in accordance with OECD 111 and EU C7. The hydrolysis measurements at pH 7 and pH 9 were technically not possible due to rapid hydrolysis of the test item at these pH values. The half lives were determined to be as follows at pH 4: 1.42 hours at 10°C, 0.66 hours at 15°C, 0.30 hours at 20°C, 0.15 hours at 25°C.
Reference
Table 1
Main Test pH 4: Hydrolysis of the reaction product of
N-Phenyl-diethanolamine with a single molecule of formaldehyde at 10°C
Sampling time
|
Analyzed concentration [mg/L] |
Relative concentration |
Logarithm relative |
pH |
0.00 |
4.96 |
101 |
2.01 |
4.1 |
0.00 |
4.82 |
99 |
1.99 |
4.1 |
0.18 |
4.25 |
87 |
1.94 |
n.a. |
0.18 |
4.99 |
102 |
2.01 |
n.a. |
0.35 |
4.22 |
86 |
1.94 |
n.a. |
0.35 |
4.28 |
87 |
1.94 |
n.a. |
0.50 |
4.11 |
84 |
1.92 |
n.a. |
0.50 |
3.78 |
77 |
1.89 |
n.a. |
0.68 |
3.58 |
73 |
1.87 |
n.a. |
0.68 |
3.20 |
65 |
1.82 |
n.a. |
1.20 |
2.79 |
57 |
1.76 |
n.a. |
1.20 |
3.01 |
62 |
1.79 |
n.a. |
2.08 |
1.65 |
34 |
1.53 |
n.a. |
2.08 |
1.59 |
33 |
1.51 |
n.a. |
3.20 |
1.02 |
21 |
1.32 |
n.a. |
3.20 |
0.913 |
19 |
1.27 |
n.a. |
4.15 |
0.52 1 |
11 |
1.03 |
n.a. |
4.15 |
0.63 1 |
13 |
1.11 |
n.a. |
5.10 |
0.45 1 |
9.2 |
0.97 |
4.1 |
5.10 |
0.48 1 |
10 |
0.99 |
4.1 |
1 Estimated value, calculated by extrapolation of the calibration curve.
n.a. Not applicable.
Table 2
Main Test at pH 4: Hydrolysis of the reaction product of
N-Phenyl-diethanolamine with a single molecule of formaldehyde at 15°C
Sampling time
|
Analyzed concentration [mg/L] |
Relative concentration |
Logarithm relative |
pH |
0.00 |
5.52 |
102 |
2.01 |
4.1 |
0.00 |
5.33 |
98 |
1.99 |
4.1 |
0.17 |
4.58 |
84 |
1.93 |
n.a. |
0.17 |
4.46 |
82 |
1.92 |
n.a. |
0.33 |
3.74 |
69 |
1.84 |
n.a. |
0.33 |
3.97 |
73 |
1.86 |
n.a. |
0.50 |
3.25 |
60 |
1.78 |
n.a. |
0.50 |
3.16 |
58 |
1.76 |
n.a. |
0.67 |
3.04 |
56 |
1.75 |
n.a. |
0.67 |
2.65 |
49 |
1.69 |
n.a. |
0.83 |
2.19 |
40 |
1.61 |
n.a. |
0.83 |
2.39 |
44 |
1.64 |
n.a. |
1.00 |
2.14 |
39 |
1.60 |
n.a. |
1.00 |
2.02 |
37 |
1.57 |
n.a. |
1.17 |
1.60 |
30 |
1.47 |
n.a. |
1.17 |
1.70 |
31 |
1.50 |
n.a. |
1.33 |
1.54 |
28 |
1.45 |
n.a. |
1.33 |
1.22 |
22 |
1.35 |
n.a. |
1.50 |
1.03 |
19 |
1.28 |
n.a. |
1.50 |
1.03 |
19 |
1.28 |
n.a. |
43.87 |
n.d. |
n.a. |
n.a. |
4.1 |
43.87 |
n.d. |
n.a. |
n.a. |
4.1 |
n.d. Not detected.
n.a. Not applicable.
Table 3
Main Test at pH 4: Hydrolysis of the reaction product of
N-Phenyl-diethanolamine with a single molecule of formaldehyde at 20°C
Sampling time
|
Analyzed concentration [mg/L] |
Relative concentration |
Logarithm relative |
pH |
0.00 |
4.88 |
101 |
2.01 |
4.1 |
0.00 |
4.76 |
99 |
1.99 |
4.1 |
0.17 |
4.26 |
88 |
1.95 |
n.a. |
0.17 |
3.38 |
70 |
1.85 |
n.a. |
0.33 |
2.94 |
61 |
1.79 |
n.a. |
0.33 |
2.40 |
50 |
1.70 |
n.a. |
0.50 |
1.62 |
34 |
1.53 |
n.a. |
0.50 |
1.78 |
37 |
1.57 |
n.a. |
0.67 |
1.30 |
27 |
1.43 |
n.a. |
0.67 |
1.40 |
29 |
1.46 |
n.a. |
0.83 |
0.964 |
20 |
1.30 |
n.a. |
0.83 |
0.907 |
19 |
1.27 |
n.a. |
1.00 |
0.65 1 |
14 |
1.13 |
n.a. |
1.00 |
0.55 1 |
11 |
1.06 |
n.a. |
1.17 |
0.44 1 |
9.1 |
0.96 |
n.a. |
1.17 |
0.36 1 |
7.6 |
0.88 |
n.a. |
1.33 |
0.20 1 |
4.2 |
0.62 |
n.a. |
1.33 |
0.29 1 |
6.0 |
0.78 |
n.a. |
1.50 |
0.16 1 |
3.4 |
0.53 |
4.1 |
1.50 |
0.17 1 |
3.5 |
0.54 |
4.1 |
1 Estimated value, calculated by extrapolation of the calibration curve.
n.a. Not applicable.
Table 4
Main Test pH 4: Recoveries
Temperature |
Nominal concentration |
Analyzed concentration |
Recovery |
|
Individual |
Mean |
|||
10 |
5.00 |
4.96 |
99 |
98 |
|
5.00 |
4.82 |
96 |
|
15 |
5.00 |
5.52 |
110 |
109 |
|
5.00 |
5.33 |
107 |
|
20 |
5.00 |
4.88 |
98 |
96 |
|
5.00 |
4.76 |
95 |
|
For testing of pseudo-first order kinetics the mean logarithms of the relative concentrations between 10% and 90% were plotted against time. At all temperatures linear relationships were obtained.
The half-life time of the reaction product of N-Phenyl-diethanolamine with a single molecule of formaldehyde was determined according to the model for pseudo-first order reactions. All logarithms of the relative concentrations were correlated with time using linear regression analysis. Table 5 shows the statistical parameters.
Table 5
Main Test pH 4: Statistical Parameters Regression Curves
Temperature |
Slope |
Intercept |
Coefficient of correlation |
10 |
-2.13 ´ 10-1 |
2.00 |
0.995 |
15 |
-4.59 ´ 10-1 |
2.01 |
0.992 |
20 |
-9.88 ´ 10-1 |
2.06 |
0.994 |
The rate constant (kobs) and half-life time of the test item at each temperature was obtained and the Arrhenius equation was used to determine the rate constant and half-life time at 25°C (see Table 6).
Table 6
Main Test pH 4: Rate Constants (kobs) and Half-life Time (t½)
Temperature |
kobs |
t½ |
10 |
4.90 ´ 10-1 |
1.42 hours |
15 |
1.06 ´ 100 |
0.66 hours |
20 |
2.27 ´ 100 |
0.30 hours |
25 |
4.70 ´ 100 |
0.15 hours 1 |
1 calculated with the Arrhenius equation
For testing of pseudo-first order kinetics the mean logarithms of the relative concentrations between 10% and 90% were plotted against time. At all temperatures linear relationships were obtained.
Description of key information
At pH 4: t1/2(10°C) = 1.42 hours, t1/2(15°C) = 0.66 hours, t1/2(20°C) = 0.30 hours, t1/2(25°C) = 0.15 hours; OECD 111; Petrovic, D. (2020)
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 0.15 h
- at the temperature of:
- 25 °C
Additional information
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