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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
GLP compliance:
no
Type of method:
flask method
Key result
Water solubility:
2 904.31 mg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
15 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
7
Remarks on result:
other: The measurement was conducted in demineralized water. Thus a pH value of 7 can be assumed.
Water solubility:
2 882.97 mg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
15 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
7
Remarks on result:
other: flask 2
Water solubility:
2 887.88 mg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
15 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
7
Remarks on result:
other: flask 3
Water solubility:
2 913.25 mg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
15 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
7
Remarks on result:
other: flask 4
Water solubility:
2 927.47 mg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
15 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
7
Remarks on result:
other: flask 5
Water solubility:
2 909.99 mg/L
Conc. based on:
test mat. (dissolved fraction)
Loading of aqueous phase:
15 g/L
Incubation duration:
3 d
Temp.:
20 °C
pH:
7
Remarks on result:
other: flask 6
Details on results:
In the main study, one loading rate of the test item was chosen: 15 g/L (nominal). Three flasks 1A – C were sampled during equilibration. Seven vessels (flasks blank, 1C (for the sampling point 72 h) and 2 – 6) were set onto the shaking apparatus immediately. After 24 ± 2 hours, flask 1B (for the sampling point 48 h) and after 48 ± 2 hours, flask 1A (for the sampling point 24 h) were set on the shaker and all flasks were shaken for further 24 ± 2 hours at room temperature. Then, flasks 1A - 1C were taken from the shaker and tempered to 20 ± 0.5°C. The samples were taken, membrane filtered and analysed for test item concentration via HPLC.

No differences above 15% and no rising tendency in the concentration of the solutions could be determined between the samplings of day 1 - 3, supporting the hypothesis that equilibrium had been reached after one day.
Therefore the final measurement was performed as determination from flasks 2 – 6. Test item concentration was measured via HPLC in the saturated aqueous solutions. The pH value in the flasks 2 – 6 lay in the range of 1.64 – 1.70.
No Tyndall effect (i.e. a laser beam was not scattered when transmitted through the liquid) could be observed indicating that no colloidal dispersed particles are present.

At the plateau, the concentration of L-Tyrosine, 3,5-dinitro- (wet product) in water had reached
2904.31 ± 18.53 mg/L at 20.0 ± 0.5 °C
= 2.904 ± 0.019 kg/m3 (SI units)
(mean value ± standard deviation of five individual vessels)
Conclusions:
A test item concentration of 2904.31 mg/L ± 18.53 mg/L (mean ± standard deviation) at 20.0 ± 0.5 °C (2.904 ± 0.019 kg/m3 (SI units)) was calculated, giving a relative standard deviation of 0.6 %.

Description of key information

In a study according to OECD 105 a test item concentration of  2904.31 mg/L ± 18.53 mg/L (mean ± standard deviation) at 20.0 ± 0.5 °C was calculated, giving a relative standard deviation of 0.6 %.

Key value for chemical safety assessment

Water solubility:
2 904.31 mg/L
at the temperature of:
20 °C

Additional information