Gum turpentine oil, consisting of the volatile fraction resulting from the distillation of oleoresin collected by tapping softwoods from pinacea derivatives (genus: pinus). It consists of terpenes, mainly monoterpenes such as alpha-pinene and beta-pinene.

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

September 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other 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:

static method

Key result

Temp.:

20 °C

Vapour pressure:

519 Pa

Temp.:

25 °C

Vapour pressure:

669 Pa

The calculation results are presented in the following table:

Calculated values for 1/T and log P

n	t	P	T	1/T	log P
	°C	mbar = hPa	K	1/K	log P (Pa)
1	20.0	4.8	293.15	0.00341122	2.6812
2	19.9	4.8	293.05	0.00341239	2.6812
3	26.1	6.4	299.25	0.00334169	2.8062
4	27.7	7.2	300.85	0.00332392	2.8573
5	26.8	7.0	299.95	0.00333389	2.8451
6	37.0	11.2	310.15	0.00322425	3.0492
7	43.4	15.4	316.55	0.00315906	3.1875
8	47.7	19.0	320.85	0.00311672	3.2788
9	53.2	23.7	326.35	0.00306419	3.3747
10	53.8	24.8	326.95	0.00305857	3.3945
11	57.0	28.2	330.15	0.00302893	3.4502
12	61.4	33.2	334.55	0.00298909	3.5211
13	63.4	36.2	336.55	0.00297133	3.5587
14	55.7	27.5	328.85	0.00304090	3.4393
15	49.0	21.0	322.15	0.00310414	3.3222
16	43.3	16.6	316.45	0.00316006	3.2201
17	39.4	14.1	312.55	0.00319949	3.1492
18	36.7	12.4	309.85	0.00322737	3.0934
19	32.9	10.7	306.05	0.00326744	3.0294
20	29.2	9.1	302.35	0.00330743	2.9590
21	21.9	6.8	295.05	0.00338926	2.8325

The parameters for the linear regression of the above graph are presented in the following table:

Linear Regression Parameters

Parameter	Value
Slope B	-1935.07
Intercept A	9.316
Correlation coefficient r	-0.9945

Using the equation log P = B*1/T + A, values of vapour pressure at 20 and 25 °C were calculated.

Conclusions:

Using the static method according to OECD Guideline 104 and EU method A.4, vapour pressures of 519 Pa at 20 °C and 669 Pa at 25 °C were estimated for the test item.
These values were calculated from the regression of 21 individual measurements.

Executive summary:

Vapour pressure of GUM TURPENTINE OIL was measured using the static method according to OECD guideline 104 and EU method A.4. Thanks to the equation log P = B*1/T + A and the linear regression parameters of 21 individual measurements between 20 and 63.4°C, the vapour pressure of the test item was calculated as 519 Pa at 20 °C and as 669 Pa at 25.0 °C.

The correlation coefficient r being -0.9945, the linear regression is very good and the results are considered as valid. No observations were made which might cause doubts concerning the validity of the study outcome.

Description of key information

The vapour pressure of GUM TURPENTINE OIL was determined using the static method

(calculated from the regression of 21 individual measurements):
519 Pa at 20°C
669 Pa at 25°C

Key value for chemical safety assessment

Vapour pressure:

519 Pa

at the temperature of:

20 °C

Additional information

A study was conducted according to OECD Guideline 104 and method EU A.4 to measure the vapour pressure of GUM TURPENTINE OIL. As the results were obtained under GLP without deviation, they were considered as valid and reliable without restriction and used to propose a key value.