Registration Dossier
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EC number: 242-768-1 | CAS number: 19035-79-1
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2012-01-24
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: by loss of weight or by trapping vaporisate
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.003 Pa
- Conclusions:
- The vapour pressure of potassium hexadecyl hydrogen phosphate K at 20°C was determined to be 2.89 x 10E-3 Pa.
- Executive summary:
A study was conducted according to Regulation (EC) No 440/2008 method A.4 using the isothermal thermogravimetry method. Below 100 °C no significant weight loss was observed. The determination was repeated applying temperatures above 100 °C. A value of the vapour pressure of potassium hexadecyl hydrogen phosphate could only be determined using the data obtained above 100 °C. The vapour pressure of potassium hexadecyl hydrogen phosphate at 20 °C (293 K) was calculated to be 2.89 x 10E-3 Pa.
Reference
Using the temperature program below 100 °C no significant weight loss was observed. At these temperatures the vapour pressure cannot be determined with sufficient accuracy. The determination was repeated applying temperatures above 100 °C. The coefficient of correlation (r) was 0.9961. Extrapolation of the curve to 20 °C and fitting this value in the regression curve, a vapour pressure of 2.89 x 10E-3 Pa was obtained (temperature program 100 °C to 150 °C, evaluation at 110 °C to 140 °C).
Description of key information
The vapour pressure of potassium hexadecyl hydrogen phosphate at 20°C (293K) was calculated to be 2.89 x 10E-3 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 0.003 Pa
- at the temperature of:
- 20 °C
Additional information
A study was conducted according to Regulation (EC) No 440/2008 method A.4 using the isothermal thermogravimetry method. Below 100 °C no significant weight loss was observed. The determination was repeated applying temperatures above 100 °C. A value of the vapour pressure of potassium hexadecyl hydrogen phosphate could only be determined using the data obtained above 100 °C. The vapour pressure of potassium hexadecyl hydrogen phosphate at 20 °C (293 K) was calculated to be 2.89 x 10e-3 Pa.
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