Diphenyl[4-(phenylsulfanyl)phenyl] sulfonium hexafluoroantimonate(1-)

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

21 November 2018 to 23 November 2018

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

There is a deviation in the recommended range of temperatures due to the low vapour pressures obtained and also due to the observed melting poiint, so this is considered acceptable

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

yes

Remarks:

The temperature range varies from that recommended in the testing guideline.

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of Inspection: 21 August 2018 Date on Certificate: 19 November 2018

Type of method:

effusion method: vapour pressure balance

Key result

Test no.:

#6

Temp.:

25 °C

Vapour pressure:

<= 0.002 Pa

Recorded temperatures, mass differences and the resulting calculated values of vapour pressure are shown in the following tables:

Run 4

Table 1 - Vapour Pressure Data

Temperature (°C)	Temperature (K)	Reciprocal Temperature (K-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
99	372.15	0.002687	3.89	3.890e-09	0.00540	-2.26761
100	373.15	0.002680	5.29	5.290e-09	0.00734	-2.13430
101	374.15	0.002673	5.59	5.590e-09	0.00776	-2.11014
102	375.15	0.002666	5.39	5.390e-09	0.00748	-2.12610
103	376.15	0.002659	4.89	4.890e-09	0.00679	-2.16813
104	377.15	0.002651	5.29	5.290e-09	0.00734	-2.13430
105	378.15	0.002644	5.09	5.090e-09	0.00707	-2.15058
106	379.15	0.002637	6.89	6.890e-09	0.00957	-2.01909
107	380.15	0.002631	6.39	6.390e-09	0.00887	-2.05208
108	381.15	0.002624	5.69	5.690e-09	0.00790	-2.10237
109	382.15	0.002617	6.09	6.090e-09	0.00845	-2.07314

No statistical analysis is given due to the nature of the plot.

Run 5

Table 2 - Vapour Pressure Data

Temperature (°C)	Temperature (K)	Reciprocal Temperature (K-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
99	372.15	0.002687	5.19	5.190e-09	0.00721	-2.14206
100	373.15	0.002680	4.29	4.290e-09	0.00596	-2.22475
101	374.15	0.002673	5.69	5.690e-09	0.00790	-2.10237
102	375.15	0.002666	5.19	5.190e-09	0.00721	-2.14206
103	376.15	0.002659	6.29	6.290e-09	0.00873	-2.05899
104	377.15	0.002651	5.39	5.390e-09	0.00748	-2.12610
105	378.15	0.002644	6.29	6.290e-09	0.00873	-2.05899
106	379.15	0.002637	6.49	6.490e-09	0.00901	-2.04528
107	380.15	0.002631	5.69	5.690e-09	0.00790	-2.10237
108	381.15	0.002624	5.79	5.790e-09	0.00804	-2.09474
109	382.15	0.002617	4.39	4.390e-09	0.00609	-2.21538

No statistical analysis is given due the nature of the plot.

Run 6

Table 3 - Vapour Pressure Data

Temperature (°C)	Temperature (K)	Reciprocal Temperature (K-1)	Mass Difference (µg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
99	372.15	0.002687	5.19	5.190e-09	0.00721	-2.14206
100	373.15	0.002680	5.69	5.690e-09	0.00790	-2.10237
101	374.15	0.002673	5.49	5.490e-09	0.00762	-2.11805
102	375.15	0.002666	2.50	2.590e-09	0.00347	-2.45967
103	376.15	0.002659	6.39	6.390e-09	0.00887	-2.05208
104	377.15	0.002651	4.39	4.390e-09	0.00609	-2.21538
105	378.15	0.002644	4.69	4.690e-09	0.00651	-2.18642
106	379.15	0.002637	5.59	5.590e-09	0.00776	-2.11014
107	380.15	0.002631	7.39	7.390e-09	0.01026	-1.98885
108	381.15	0.002624	5.59	5.590e-09	0.00776	-2.11014
109	382.15	0.002617	6.59	6.590e-09	0.00915	-2.03858

No statistical analysis is given due to the nature of the plot

The test item did not change in appearance under the conditions used in the determination.

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead 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 25°C.

Run 6 was chosen because the sample had been under vaccum for the longest period prior to this run and so degassing would have been the most complete. The reading at 107 °C (380.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1000 K is imposed upon it.

The value of - 1000K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method.

Extrapolation to 25 °C gave a vapour pressure of 1.94 x 10^-3 Pa which has been taken as a maximum for this material.

Conclusions:

The vapour pressure of the test item has been determined to be less than 2.0E-03 Pa at 25°C.

Executive summary:

The vapour pressure of the test item has been determined to be to be less than 2.0 x 10^-03 Pa at 25°C, using the vapour pressure balance method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No. 440/2008 (as amended) of 30 May 2008, and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006. The vapour pressure value at 25 °C was extrapolated from the reading at 107 °C.

Description of key information

< 2.0 x 10^-03Pa at 25°C; OECD 104; Ford A J (2019)

Key value for chemical safety assessment

Vapour pressure:

0.002 Pa

at the temperature of:

25 °C

Additional information

The key value reported is taken to be a maximum for the test material.