Cesium formate

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From October 23, 2009 to 26 November 26, 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: vapour pressure balance

Key result

Temp.:

25 °C

Vapour pressure:

0.48 kPa

No statistical analyses were performed because the balance reading was too low and variable. Therefore, it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25⁰C. 

Conclusions:

Under the study conditions the vapour pressure of the test substance was determined to be 4.8-E04 Pa at 25⁰C.

Executive summary:

A study was conducted to determine the vapour pressure of the test substance according to EU Method A.4, in compliance with GLP. The vapour pressure was established using a vapour pressure balance. A sequence of run (five) after a sample of test substance had been under vacuum for approximately 1 h and 45 min was started. Temperature and pressure were taken between 90 and 100⁰C with 1 h dwell at 90⁰C between runs. The vapour pressure was measured over a range of temperatures. To enable extrapolation to 298.15 K, the reading at 97⁰C (run 5) was chosen as this data point gives the highest estimated vapour pressure at any given temperature when a slope of -1500 k is imposed on it. Under the study conditions the vapour pressure of the test substance was determined to be 4.8-E04 Pa at 25⁰C (Atwal S, 2009).

 

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1998

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

A) The study was conducted according to a method similar to OECD Guideline 104. However, no mention of GLP was made. B) Well-defined information were provided on: 1. Compositional information of the test substance (identity and purity) 2. Test method used in the study 3. Detailed test result (vapour pressure data) 4. Definite conclusion

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

not specified

Principles of method if other than guideline:

The study was carried out according to a modified static method (OECD Guideline no. 104) wherein the test solution was stirred magnetically and the vapour pressures were measured by a low-pressure heated transducer.

GLP compliance:

no

Type of method:

static method

Temp.:

ca. 17.26 °C

Vapour pressure:

ca. 384 Pa

Remarks on result:

other: The sample temperature crossed the TCT value here

Key result

Temp.:

ca. 20 °C

Vapour pressure:

ca. 466 Pa

Key result

Temp.:

ca. 25 °C

Vapour pressure:

ca. 732 Pa

Key result

Transition / decomposition:

yes

Transition temp.:

ca. 17 °C

Vapour pressure at 10°C above transition temperature:

848 Pa

Reduced data for Vapour pressure:

Average temperature (°C)	Temperature Std. dev.	Average pressure (Pa)	Pressure Std. dev.	1/K
17.26	7.60	384	3.1	0.00344
19.48	8.10	461	3.6	0.00342
22.38	6.90	586	0.0	0.00338
24.74	7.40	718	4.2	0.00336
27.15	3.80	848	3.7	0.00333
29.41	2.70	1005	9.7	0.00331
31.90	3.80	1168	3.6	0.00328
34.30	2.25	1377	6.50	0.00325
36.69	5.10	1602	3.4	0.00323
38.84	4.80	1789	5.1	0.00321

Conclusions:

Under the study conditions the vapour pressure of the test substance was 466 Pa at 20°C and rose to 732 Pa at 25°C.

Executive summary:

A study was conducted to determine the vapour pressure of the test substance solution according to a modified static method closely resembling OECD Guideline 104. The test substance solution was stirred magnetically and the vapour pressures were measured by a low-pressure heated transducer. The vapour pressure of the test substance solution was measured over a range of 1 to 39°C. The sample has a phase transition, which should occur at 17°C. The sample remained as a super-cooled liquid at temperatures below 17°C. Under the study conditions the vapour pressure of the test substance was 466 Pa at 20°C and rose to 732 Pa at 25°C (Pelletier M, 1998).

Reference 3

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Well conducted and well documented study with reliable results but not run according to GLP.

Principles of method if other than guideline:

Method followed unknown, data from technical manual.

GLP compliance:

no

Type of method:

other: No data

Key result

Temp.:

>= 18 °C

Vapour pressure:

> 400 Pa

Conclusions:

The vapour pressure of the test substance was determined to be > 400 Pa at ≥18°C.

Executive summary:

A study was conducted to determine the vapour pressure of the test substance solution using method from Technical Manual, part A: chemical and physical properties, section A3: water activity and colligative properties. Under the study conditions the vapour pressure of the test substance was determined to be > 400 Pa at ≥18°C (Company data, 2008).

Description of key information

Solid form: the vapour pressure was determined according to EU Method A.4.

Brine: the vapour pressure was determined according to:

- Modified static method closely resembling OECD Guideline 104.

- Technical manual, Part A: chemical and physical properties, Section A3: water activity and colligative properties.

Key value for chemical safety assessment

Vapour pressure:

466 Pa

at the temperature of:

293 K

Additional information

Solid form: 4.8-E04 Pa at 25⁰C

Brine: 466 Pa at 20°C and rose to 732 Pa at 25°C (method similar to OECD Guideline 104); > 400 Pa at ≥18°C (Technical manual)