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Physical & Chemical properties

Vapour pressure

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Reference
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:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
other: OECD Guideline 113 (1981) Thermal stability
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
this guideline also applies to the result
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
During inquiry (inquiry number: 06-2120767575-41-0000 ) the name was changed from „Reaction mass of metaphosphoric acid and trisodium trimetaphosphate” to “Amorphous condensation products of orthophosphoric acid and sodium carbonate (3-6 : 1)“.
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
< 0.01 Pa
Remarks on result:
other:
Remarks:
Due to the fact that the test item showed no proper linear correlation of the logarithm of the vapour pressure and the inverse temperature 1/T using both effusion methods, the Antoine constants cannot be evaluated in the measured temperature range. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum measured vapour pressures of 9.10 x 10-3 Pa at a temperature 81 °C using the Knudsen cell method
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
< 0.01 Pa
Remarks on result:
other:
Remarks:
Due to the fact that the test item showed no proper linear correlation of the logarithm of the vapour pressure and the inverse temperature 1/T using both effusion methods, the Antoine constants cannot be evaluated in the measured temperature range. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum measured vapour pressures of 9.10 x 10-3 Pa at a temperature 81 °C using the Knudsen cell method
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
< 0.01 Pa
Remarks on result:
other:
Remarks:
Due to the fact that the test item showed no proper linear correlation of the logarithm of the vapour pressure and the inverse temperature 1/T using both effusion methods, the Antoine constants cannot be evaluated in the measured temperature range. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum measured vapour pressures of 9.10 x 10-3 Pa at a temperature 81 °C using the Knudsen cell method

Thermal Stability

No thermal effects could be detected up to the maximum test temperature of 300 °C.

Table 1 :    Results of the DSC-measurement    

No.

Sample weight / mg

Start / °C

Energy / Jig

Remark

PN12840

Glass

---

---

Figure 2

Effusion method: Knudsen cell

The vapour pressure was determined for twelve temperatures in the temperature range of 20 - 141 °C. Since no evaluable vapour pressure curve could be determined , further tests were performed using the vapour pressure balance.

The measured vapour pressure values together with the measured temperatures of the Knudsen cell method are listed in Table 2:

Table 2:     Results of the Effusion method using the Knudsen cell method

No.

Temperature / °C

Vapour pressure / Pa

1

20

2.02 x 10-3

2

30

5.69 x 10-3

3

41

5.74 x 10-3

4

51

4.59 x 10-3

5

61

5.39 x 10-3

6

71

5.07 x 10-3

7

81

9.10 x 10-3

8

101

7.65 x 10-3

9

111

3.95 x 10-3

10

121

3.79 x 10-3

11

131

7.43 x 10-3

12

141

4.62 x 10-3

 

Effusion method: Vapour pressure balance

In the first measurement , a vapour pressure could be determined in the temperature range of 168 - 179 °C at the end of the measurement. Due to the fact that only two evaluable vapour pressure values could be determined, a second measurement with fresh test item was carried out in the temperature range of 173 - 224 °C for eight temperatures. Also no evaluable vapour pressure curve could be determined in measured temperature range using the vapour pressure balance.

The measured vapour pressure values of both measurements together with the measured temperatures using the vapour pressure balance are listed in Table 3:

Table 3:               Results of the Effusion method using the vapour pressure balance

 

No.

Temperature / °C

Vapour pressure / Pa

1-1

168

2.90 x 10-3

1-2

179

4.00 x 10-3

2-1

173

4.78 x 10-3

2-2

179

4.40 x 10-3

2-3

189

4.52 x 10-3

2-4

194

3.82 x 10-3

2-5

204

4.31 x 10-3

2-6

214

3.81 x 10-3

2-7

219

7.71 x 10-3

2-8

224

4.84 x 10-3

 

 

Conclusions:
The test item showed no evaluable vapour pressure curve in the temperature range of 20 - 224 °C. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum vapour pressures measured by using the Knudsen cell method, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006)

Temperature/ °C Vapour pressure / Pa
20 < 10-2
25 < 10-2
50 < 10-2
Executive summary:

Due to the fact that the test item showed no proper linear correlation of the logarithm of the vapour pressure and the inverse temperature 1/T using both effusion methods, the Antoine constants cannot be evaluated in the measured temperature range. Due to this result, the vapour pressure for the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum measured vapour pressures of 9.10 x 10-3 Pa at a temperature 81 °C using the Knudsen cell method. The estimated vapour pressures are shown in Table below (estimated vapour pressure values for 20, 25 and 50 °C):

 

Temperature / °C

Vapour pressure / Pa

20

< 10-2

25

< 10-2

50

< 10-2

Description of key information

The test item amorphous condensation products of orthophosphoric acid and sodium carbonate (3-6 : 1) showed no evaluable vapour pressure curve in the temperature range of 20 - 224 °C. Due to this result, the vapour pressure for  the temperatures 20, 25 and 50 °C is estimated on the basis of the maximum vapour pressures measured by using the Knudsen cell method, according to Regulation EC  No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006)

Temperature/ °C       Vapour pressure / Pa

20                           < 10-2

25                           < 10-2

50                           < 10-2

Key value for chemical safety assessment

Vapour pressure:
0.01 Pa
at the temperature of:
20 °C

Additional information