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EC number: 203-509-8 | CAS number: 107-66-4
- 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
- Sensitisation
- 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
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- 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
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- not specified
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- not specified
- GLP compliance:
- no
- Type of method:
- other: Combination of "effusion method: by loss of weight or by trapping vaporisate" and "static method"
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from experimental values
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from experimental values
- Temp.:
- 49.95 °C
- Vapour pressure:
- 0.01 Pa
- Remarks on result:
- other: experimental result (Knudsen effusion method, average of two measurements)
- Temp.:
- 50 °C
- Vapour pressure:
- 0.01 Pa
- Remarks on result:
- other: calculated from experimental values
- Temp.:
- 55 °C
- Vapour pressure:
- 0.02 Pa
- Remarks on result:
- other: calculated from experimental values
- Temp.:
- 59.95 °C
- Vapour pressure:
- 0.045 Pa
- Remarks on result:
- other: experimental result (Knudsen effusion method, average of two measurements)
- Temp.:
- 69.95 °C
- Vapour pressure:
- 0.127 Pa
- Remarks on result:
- other: experimental result (Knudsen effusion method, average of two measurements)
- Temp.:
- 90 °C
- Vapour pressure:
- 1.3 Pa
- Remarks on result:
- other: experimental result (static method, average of three measurements)
- Temp.:
- 110 °C
- Vapour pressure:
- 8.54 Pa
- Remarks on result:
- other: experimental result (static method, average of three measurements)
- Temp.:
- 129.2 °C
- Vapour pressure:
- 46.37 Pa
- Remarks on result:
- other: experimental result (static method, average of three measurements)
- Conclusions:
- The vapor pressure of dibutyl hydrogen phosphate is 0.000115 Pa at 20 °C.
- Executive summary:
The vapor pressure of dibutyl phosphate was measured using the Knudsen effusion method (mass-loss technique) and a static method suitable for very low vapor pressures, according to the guidelines OECD 104 / EU A.4.
The quality of both apparatus was previously verified with the measurement of well-known reference compounds. Experiments were performed at temperatures between 50 °C and 80 °C using the Knudsen effusion method, and between 80 °C and 130 °C using the static method.
Results were modeled with a thermodynamic equation, establishing the relation between the vapor pressure of the compound and temperature and allowing the knowledge of the vapor pressure at different temperatures.
Reference
Results obtained in the measurement of the vapor pressures of dibutyl hydrogen phosphate using the Knudsen effusion method.
T / °C = 49.95 t = 19h36m46s
Cell |
m / mg |
p / Pa |
I |
1.87 |
0.0100 |
IV |
1.76 |
0.0093 |
T / °C = 59.95 t = 07h27m42s
Cell |
m / mg |
p / Pa |
I |
3.40 |
0.0485 |
IV |
2.97 |
0.0418 |
T / °C = 69.95 t = 03h52m58s
Cell |
m / mg |
p / Pa |
I |
4.79 |
0.1333 |
IV |
4.40 |
0.1207 |
T / °C = 79.90 t = 02h49m38s
Cell |
m / mg |
p / Pa |
I |
10.35 |
0.4012 |
IV |
8.97 |
0.3428 |
Results obtained in the measurement of the vapor pressures of dibutyl hydrogen phosphate using the static method.
T / K |
T / °C |
p / Pa |
p / mbar |
90.00 |
363.15 |
1.30 |
0.013 |
99.40 |
372.55 |
3.18 |
0.0318 |
110.00 |
383.15 |
8.54 |
0.0854 |
119.30 |
392.45 |
18.47 |
0.1847 |
129.20 |
402.35 |
46.37 |
0.4637 |
Recommended vapor pressures for dibutyl hydrogen phosphate up to 240 °C, calculated from the application of the equation of Clarke and Glew to the results obtained in this work.
T / °C |
T / K |
p / Pa |
p / mbar |
-20 |
253.15 |
4.75E-08 |
4.75E-010 |
-15 |
258.15 |
1.45E-07 |
1.45E-09 |
-10 |
263.15 |
4.22E-07 |
4.22E-09 |
-5 |
268.15 |
1.18E-06 |
1.18E-08 |
0 |
273.15 |
3.16E-06 |
3.16E-08 |
5 |
278.15 |
8.17E-06 |
8.17E-08 |
10 |
283.15 |
2.04E-05 |
2.04E-07 |
15 |
288.15 |
4.91E-05 |
4.91E-07 |
20 |
293.15 |
1.15E-04 |
1.15E-06 |
25 |
298.15 |
2.59E-04 |
2.59E-06 |
30 |
303.15 |
5.70E-04 |
5.70E-06 |
35 |
308.15 |
1.22E-03 |
1.22E-05 |
40 |
313.15 |
2.54E-03 |
2.54E-05 |
45 |
318.15 |
5.17E-03 |
5.17E-05 |
50 |
323.15 |
1.03E-02 |
1.03E-04 |
55 |
328.15 |
1.99E-02 |
1.99E-04 |
60 |
333.15 |
3.78E-02 |
3.78E-04 |
65 |
338.15 |
7.04E-02 |
7.04E-04 |
70 |
343.15 |
1.28E-01 |
1.28E-03 |
75 |
348.15 |
2.30E-01 |
2.30E-03 |
80 |
353.15 |
4.05E-01 |
4.05E-03 |
85 |
358.15 |
7.00E-01 |
7.00E-03 |
90 |
363.15 |
1.19E+00 |
1.19E-02 |
95 |
368.15 |
1.99E+00 |
1.99E-02 |
100 |
373.15 |
3.28E+00 |
3.28E-02 |
105 |
378.15 |
5.34E+00 |
5.34E-02 |
110 |
383.15 |
8.55E+00 |
8.55E-02 |
115 |
388.15 |
1.35E+01 |
1.35E-01 |
120 |
393.15 |
2.11E+01 |
2.11E-01 |
125 |
398.15 |
3.26E+01 |
3.26E-01 |
130 |
403.15 |
4.96E+01 |
4.96E-01 |
135 |
408.15 |
7.48E+01 |
7.48E-01 |
140 |
413.15 |
1.11E+02 |
1.11E+00 |
145 |
418.15 |
1.64E+02 |
1.64E+00 |
150 |
423.15 |
2.40E+02 |
2.40E+00 |
155 |
428.15 |
3.46E+02 |
3.46E+00 |
160 |
433.15 |
4.96E+02 |
4.96E+00 |
165 |
438.15 |
7.04E+02 |
7.04E+00 |
170 |
443.15 |
9.89E+02 |
9.89E+00 |
175 |
448.15 |
1.38E+03 |
1.38E+01 |
180 |
453.15 |
1.91E+03 |
1.91E+01 |
185 |
458.15 |
2.62E+03 |
2.62E+01 |
190 |
463.15 |
3.56E+03 |
3.56E+01 |
195 |
468.15 |
4.81E+03 |
4.81E+01 |
200 |
473.15 |
6.46E+03 |
6.46E+01 |
205 |
478.15 |
8.60E+03 |
8.60E+01 |
210 |
483.15 |
1.14E+04 |
1.14E+02 |
215 |
488.15 |
1.50E+04 |
1.50E+02 |
220 |
493.15 |
1.96E+04 |
1.96E+02 |
225 |
498.15 |
2.54E+04 |
2.54E+02 |
230 |
503.15 |
3.28E+04 |
3.28E+02 |
235 |
508.15 |
4.21E+04 |
4.21E+02 |
240 |
513.15 |
5.37E+04 |
5.37E+02 |
Description of key information
The vapor pressure of dibutyl hydrogen phosphate is 0.000115 Pa at 20 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
The vapor pressure of dibutyl phosphate was measured using the Knudsen effusion method (mass-loss technique) and a static method suitable for very low vapor pressures, according to the guidelines OECD 104 / EU A.4.
Results were modeled with a thermodynamic equation, establishing the relation between the vapor pressure of the compound and temperature and allowing the knowledge of the vapor pressure at different temperatures.
The vapor pressure of dibutyl hydrogen phosphate can be calculated using the following truncated equation of Clarke and Glew.
ln(p) = exp({- (ΔG / θ) + ΔH * [(1 / θ) + (1 / T)] + ΔC * [(θ / T) - 1 + ln(T / θ)]} / R)
Where p is the vapour pressure in Pa, T is the temperature in Kelvin, ΔG is the Gibbs energy of vaporization at the reference temperature θ [-389.82 J/mol], ΔH is the enthalpy of vaporization at the reference temperature θ [114715 J/mol], ΔC is the difference between the heat capacity of the gas and the heat capacity of the liquid at the reference temperature θ [-60 J/(mol K)], θ is the reference temperature [362.72 K] and R is the gas constant [8.3144621 J/(mol K)].
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