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Vapour pressure

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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:
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
Temp.:
20 °C
Vapour pressure:
0 Pa
Temp.:
25 °C
Vapour pressure:
0 Pa

The vapour pressure was calculated initially for three measurement points as below:

No.

Temperature [°C]

Vapour pressure [Pa]

1

82.9

0.26

2

99.3

1.69

3

113.6

9.46

 

The log(p) = a.1/T+b graph is shown in the attached background material section

Conclusions:
Under the study conditions, the vapour pressure as determined to be 1.51E-5 Pa at 20°C and 3.79E-5 Pa at 25°C.
Executive summary:

The vapour pressure of the test substance, C8-18 and C18-unsatd. MEA, was determined according to OECD Guideline 404 and EU Method A.4. The method was based on the determination of the mass of test substance flowing out of a Knudsen cell in the form of vapour per unit of time, through a micro-orifice under ultra-vacuum conditions. Under the study conditions, the vapour pressure as determined to be 1.51E-5 Pa at 20°C and 3.79E-5 Pa at 25°C (Petryka, 2010).

Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction from a well-known and acknowledged tool. See below under ''attached background material section' for QPRF containing methodology and domain evaluation details.
Qualifier:
according to guideline
Guideline:
other: REACH guidance on QSARs: Chapter R.6. QSARs and grouping of chemicals
Principles of method if other than guideline:
The vapour pressure (VP) value for the test substance were estimated using the Consensus method of the US EPA T.E.S.T v.4.2.1. Since the test substance is a UVCB, the VP values were predicted for the individual constituents using SMILES codes as the input parameter.
Key result
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0 - ca. 0.02 Pa
Remarks on result:
other: predicted for the main constituents (indicating low vapour pressure or volatility)
Key result
Temp.:
ca. 25 °C
Vapour pressure:
0.002 Pa
Remarks on result:
other: weighted average vapour pressure (indicating low vapour pressure or volatility)

Predicted value:

The estimated VP values for the remaining constituents using the Consensus method were as follows:

Table 1: Vapour pressure predictions: Consensus

Constituents/Carbon chain length*

Mean/adjusted conc.

Mole fraction Xi = (mi/Mi)/∑ (mi/Mi)

Vapour pressure (Pa) TEST

VP x Xi
TEST (Pa)

C8

6

0.072634408

1.96E-02

1.42E-03

C10

6

0.063169741

3.72E-03

2.35E-04

C12

53.5

0.498349014

5.12E-04

2.55E-04

C14

19

0.158688811

4.04E-05

6.41E-06

C16

9

0.068128407

4.33E-06

2.95E-07

C18

8

0.055370912

1.20E-06

6.63E-08

C18'

10

0.069643116

1.61E-06

1.12E-07

C18''

2

0.014015591

7.53E-06

1.06E-07

 

 

 

VP=

1.92E-03

*Glycerol or MEA residues have not been considered for QSAR predictions

Table 2: Domain evaluation

Substance

Model

Applicability Domain

Prediction accuracy

Carbon chain length

Concentration range

TEST Consensus

General

Descriptor

Structural

MAE for chemicals with similarity coefficient ≥ 0.5; Dataset MAE is 0.47

Accuracy

C8

≤12%

Hierarchical clustering

A prediction cannot be made

0.37

High

Group contribution

ID

ID

ID

FDA

ID

ID

ID

Nearest Neighbour 

ID

MW-ID

OD

Log Kow-ID

(similarity coefficient: 0.71-0.73; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

C10

≤12% 

Hierarchical clustering

ID

ID

ID

0.4

High

Group contribution

ID

ID

ID

FDA

ID

OD:The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-ID

OD(similarity coefficient: 0.83-0.84; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

Log Kow-ID

C12

 42-65%

Hierarchical clustering

ID

ID

ID

0.42

High

Group contribution

ID

ID

ID

FDA

ID

OD: The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-ID

OD(similarity coefficient: 0.83-0.84; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

Log Kow-ID

C14

 13-25%

Hierarchical clustering

ID

ID

ID

0.49

Low

Group contribution

ID

ID

ID

FDA

ID

OD: The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-ID

OD(similarity coefficient: 0.87-0.88; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

Log Kow-ID

C16

5-13%

Hierarchical clustering

ID

ID

ID

0.51

Low

Group contribution

ID

ID

ID

FDA

ID

OD: The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-OD

 OD(similarity coefficient: 0.88-0.90; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

Log Kow-ID

C18

1-15%

Hierarchical clustering

ID

ID

ID

0.52

Low

Group contribution

ID

ID

ID

FDA

ID

OD: The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-OD

OD(similarity coefficient: 0.88-0.91; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

Log Kow-ID

C18'

≤20%

Hierarchical clustering

ID

ID

ID

0.52

Low

Group contribution

ID

ID

ID

FDA

ID

OD: The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-OD

OD(similarity coefficient: 0.86-0.88; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

Log Kow-ID

C18''

 ≤4%

Hierarchical clustering

ID

ID

ID

0.51

Low

Group contribution

ID

ID

ID

FDA

ID

OD: The largest cluster built (75 chemicals) does not have one of each fragment present in the test chemical

Nearest Neighbour 

ID 

MW-OD

OD

Log Kow-ID

(similarity coefficient: 0.82-0.87; structural fragments: OD (missing amide (-N< [aliphatic attach]) group present in target)

MW: molecular weight, log Kow: partition coefficient; VP: Vapour pressure; ID: in domain, OD: out domain

Conclusions:
Using the Consensus method, of T.E.S.T. v4.2.1 program, the weighted average VP value for test substance was predicted to be 1.92E-03 Pa at 25°C.
Executive summary:

The vapour pressure of the test substance C8-18 and C18-unsatd. MEA was calculated using the Consensus method of T.E.S.T. v4.2.1 program. Since the test substance is a UVCB, the VP values were predicted for the individual constituents using SMILES codes as the input parameter. Using the Consensus method, the predicted VP values of the constituents ranged from 1.20E-06 to 1.96E-02 Pa at 25 °C, indicating a low vapour pressure (US EPA, 2019). As not all constituents were within the MW or the structural fragment domain criteria as defined in the T.E.S.T. user guide of EPA, the VP predictions were considered to be less accurate. Given that the constituents are structurally very similar and vary only in the carbon chain number, a weighted average value, which takes into account the percentage of the constituent in the substance, was calculated to dampen the errors in predictions. The weighted average VP value was calculated as 1.92E-03 Pa at 25 °C. Therefore, considering either the individual VP predictions for the constituents or the weighted average values, the overall test substance is expected to have a low volatility potential (ECHA, 2017) and low fugacity (ECHA, 2009), leading to low inhalation exposure to users and environmental exposure through air or via volatilization from water. Further, based on the mean absolute error (MAE) criteria, the prediction accuracy was considered to be moderate. Therefore, the VP predictions for the test substance using T.E.S.T. model overall can be considered to be of reliable with low to moderate confidence.

Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction from a well-known and acknowledged tool. See below under ''attached background material section' for QPRF containing methodology and domain evaluation details.
Qualifier:
according to guideline
Guideline:
other: REACH guidance on QSARs: Chapter R.6. QSARs and grouping of chemicals
Principles of method if other than guideline:
The vapour pressure (VP) value for the test substance were estimated using the Modified Grain method of the MPBPWIN v1.44 program in EPI SuiteTM v4.11. Since the test substance is a UVCB, the VP values were predicted for the individual constituents using SMILES codes as the input parameter.
Type of method:
other: Modified Grain method (using the MPBPWIN v1.44 program in EPI SuiteTM v4.11)
Key result
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0 - 0 Pa
Remarks on result:
other: predicted for the main constituents (indicating low vapour pressure or volatility)
Key result
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0 Pa
Remarks on result:
other: weighted average vapour pressure (indicating low vapour pressure or volatility)

Predicted value:

The estimated VP values for the remaining constituents using the modified grain method were as follows:

Table 1: Vapour pressure predictions: Modified Grain Method

Constituents/Carbon chain length*

Mean/adjusted conc

Mole fraction Xi = (mi/Mi)/∑ (mi/Mi)

VP

VP * xi

Domain evaluation

C8

6

0.072634408

4.38E-05

3.18E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C10

6

0.063169741

6.27E-06

3.96E-07

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C12

53.5

0.498349014

6.57E-09

3.27E-09

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C14

19

0.158688811

1.07E-09

1.70E-10

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C16

9

0.068128407

1.10E-09

7.49E-11

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C18

8

0.055370912

1.93E-11

1.07E-12

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C18'

10

0.069643116

1.47E-11

1.02E-12

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C18''

2

0.014015591

1.13E-11

1.58E-13

MW, MP (ID), BP, VP (OD), structural fragment (ID)

 

 

 

VP=

3.58098E-06

 

*Glycerol or MEA residues have not been considered for QSAR predictions

Table 2: Modified vapour pressure predictions: Modified Grain Method

Constituents/Carbon chain length*

Mean/adjusted conc

Mole fraction Xi = (mi/Mi)/∑ (mi/Mi)

VP

VP * xi

Domain evaluation

C8

6

0.072634408

<1.34E-4**

9.73E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C10

6

0.063169741

<1.34E-4**

8.46E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C12

53.5

0.498349014

<1.34E-4**

6.68E-05

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C14

19

0.158688811

<1.34E-4**

2.13E-05

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C16

9

0.068128407

<1.34E-4**

9.13E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C18

8

0.055370912

<1.34E-4**

7.42E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C18'

10

0.069643116

<1.34E-4**

9.33E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

C18''

2

0.014015591

<1.34E-4**

1.88E-06

MW, MP (ID), BP, VP (OD), structural fragment (ID)

 

 

 

VP=

0.000134

 

*Glycerol orMEA residues have not been considered for QSAR predictions

** Since the predicted VP values are lower than the cut-off VP value, below which the chances of introduction of error increases, the VP values are simplified and presented as less than the cut-off, instead of the individual predictions.

Vapour prediction results:

Experimental Database Structure Match: no data

 

SMILES : CCCCCCCC(=O)NCCO

CHEM  :C8

MOL FOR: C10 H21 N1 O2

MOL WT : 187.28

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 358.07 deg C (Adapted Stein and Brown Method)

 

Melting Point: 203.85 deg C (Adapted Joback Method)

Melting Point:  95.42 deg C (Gold and Ogle Method)

Mean Melt Pt : 149.63 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 122.52 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 358.07 deg C (estimated))

 (Using MP: 122.52 deg C (estimated))

   VP: 1.15E-007 mm Hg (Antoine Method)

     : 1.53E-005 Pa (Antoine Method)

   VP: 3.28E-007 mm Hg (Modified Grain Method)

     : 4.38E-005 Pa (Modified Grain Method)

   VP: 1.83E-005 mm Hg (Mackay Method)

     : 0.00245 Pa (Mackay Method)

 Selected VP: 3.28E-007 mm Hg (Modified Grain Method)

            : 4.38E-005 Pa (Modified Grain Method)

 Subcooled liquid VP: 3.06E-006 mm Hg (25 deg C, Mod-Grain method)

                    : 0.000408 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 8 | -CH2-            |  24.22 | 193.76

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 727.47

RESULT- corr | BOILING POINT in deg Kelvin | 631.23

            | BOILING POINT in deg C      | 358.07

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 8 | -CH2-            |  11.27 |  90.16

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 477.01

            | MELTING POINT in deg C      | 203.85

 

 

Experimental Database Structure Match: no data

 

SMILES : CCCCCCCCCC(=O)NCCO

CHEM  :C10

MOL FOR: C12 H25 N1 O2

MOL WT : 215.34

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 381.28 deg C (Adapted Stein and Brown Method)

 

Melting Point: 226.39 deg C (Adapted Joback Method)

Melting Point: 108.97 deg C (Gold and Ogle Method)

Mean Melt Pt : 167.68 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 138.32 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 381.28 deg C (estimated))

 (Using MP: 138.32 deg C (estimated))

   VP: 1.08E-008 mm Hg (Antoine Method)

     : 1.44E-006 Pa (Antoine Method)

   VP: 4.7E-008 mm Hg (Modified Grain Method)

     : 6.27E-006 Pa (Modified Grain Method)

   VP: 3.62E-006 mm Hg (Mackay Method)

     : 0.000483 Pa (Mackay Method)

 Selected VP: 4.7E-008 mm Hg (Modified Grain Method)

            : 6.27E-006 Pa (Modified Grain Method)

 Subcooled liquid VP: 6.52E-007 mm Hg (25 deg C, Mod-Grain method)

                    : 8.7E-005 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 10 | -CH2-            |  24.22 | 242.20

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 775.91

RESULT- corr | BOILING POINT in deg Kelvin | 654.44

            | BOILING POINT in deg C      | 381.28

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 10 | -CH2-            |  11.27 | 112.70

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 499.55

            | MELTING POINT in deg C      | 226.39

-------------------------------------------------------

 

 

Experimental Database Structure Match: no data

 

SMILES : CCCCCCCCCCCC(=O)NCCO

CHEM  :C12

MOL FOR: C14 H29 N1 O2

MOL WT : 243.39

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 404.49 deg C (Adapted Stein and Brown Method)

 

Melting Point: 248.93 deg C (Adapted Joback Method)

Melting Point: 122.52 deg C (Gold and Ogle Method)

Mean Melt Pt : 185.72 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 154.12 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 404.49 deg C (estimated))

 (Using MP: 154.12 deg C (estimated))

   VP: 9.11E-010 mm Hg (Antoine Method)

     : 1.21E-007 Pa (Antoine Method)

   VP: 6.57E-009 mm Hg (Modified Grain Method)

     : 8.76E-007 Pa (Modified Grain Method)

   VP: 7.02E-007 mm Hg (Mackay Method)

     : 9.36E-005 Pa (Mackay Method)

 Selected VP: 6.57E-009 mm Hg (Modified Grain Method)

            : 8.76E-007 Pa (Modified Grain Method)

 Subcooled liquid VP: 1.37E-007 mm Hg (25 deg C, Mod-Grain method)

                    : 1.82E-005 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 12 | -CH2-            |  24.22 | 290.64

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 824.35

RESULT- corr | BOILING POINT in deg Kelvin | 677.65

            | BOILING POINT in deg C      | 404.49

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 12 | -CH2-            |  11.27 | 135.24

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 522.09

            | MELTING POINT in deg C      | 248.93

-------------------------------------------------------

 

 

Experimental Database Structure Match: no data

 

SMILES : CCCCCCCCCCCCCC(=O)NCCO

CHEM  :C14

MOL FOR: C16 H33 N1 O2

MOL WT : 271.45

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 427.69 deg C (Adapted Stein and Brown Method)

 

Melting Point: 271.47 deg C (Adapted Joback Method)

Melting Point: 136.07 deg C (Gold and Ogle Method)

Mean Melt Pt : 203.77 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 163.15 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 427.69 deg C (estimated))

 (Using MP: 163.15 deg C (estimated))

   VP: 8.21E-011 mm Hg (Antoine Method)

     : 1.09E-008 Pa (Antoine Method)

   VP: 1.07E-009 mm Hg (Modified Grain Method)

     : 1.43E-007 Pa (Modified Grain Method)

   VP: 1.56E-007 mm Hg (Mackay Method)

     : 2.08E-005 Pa (Mackay Method)

 Selected VP: 1.07E-009 mm Hg (Modified Grain Method)

            : 1.43E-007 Pa (Modified Grain Method)

 Subcooled liquid VP: 2.82E-008 mm Hg (25 deg C, Mod-Grain method)

                    : 3.76E-006 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 14 | -CH2-            |  24.22 | 339.08

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 872.79

RESULT- corr | BOILING POINT in deg Kelvin | 700.85

            | BOILING POINT in deg C      | 427.69

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 14 | -CH2-            |  11.27 | 157.78

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 544.63

            | MELTING POINT in deg C      | 271.47

-------------------------------------------------------

 

 

Experimental Database Structure Match:

 Name    : Palmidrol

 CAS Num : 000544-31-0

 Exp MP (deg C): 98.5

 Exp BP (deg C): ---

 Exp VP (mm Hg): ---

 

SMILES : CCCCCCCCCCCCCCCC(=O)NCCO

CHEM  :C16

MOL FOR: C18 H37 N1 O2

MOL WT : 299.50

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 450.90 deg C (Adapted Stein and Brown Method)

 

Melting Point: 294.01 deg C (Adapted Joback Method)

Melting Point: 149.62 deg C (Gold and Ogle Method)

Mean Melt Pt : 221.81 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 178.50 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 450.90 deg C (estimated))

 (Using MP: 98.50 deg C (exp database))

   VP: 4.25E-011 mm Hg (Antoine Method)

     : 5.67E-009 Pa (Antoine Method)

   VP: 1.1E-009 mm Hg (Modified Grain Method)

     : 1.47E-007 Pa (Modified Grain Method)

   VP: 1.84E-007 mm Hg (Mackay Method)

     : 2.45E-005 Pa (Mackay Method)

 Selected VP: 1.1E-009 mm Hg (Modified Grain Method)

            : 1.47E-007 Pa (Modified Grain Method)

 Subcooled liquid VP: 5.72E-009 mm Hg (25 deg C, Mod-Grain method)

                    : 7.62E-007 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 16 | -CH2-            |  24.22 | 387.52

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 921.23

RESULT- corr | BOILING POINT in deg Kelvin | 724.06

            | BOILING POINT in deg C      | 450.90

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 16 | -CH2-            |  11.27 | 180.32

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 567.17

            | MELTING POINT in deg C      | 294.01

-------------------------------------------------------

 

 

Experimental Database Structure Match: no data

 

SMILES : CCCCCCCCCCCCCCCCCC(=O)NCCO

CHEM  :C18

MOL FOR: C20 H41 N1 O2

MOL WT : 327.56

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 474.11 deg C (Adapted Stein and Brown Method)

 

Melting Point: 316.55 deg C (Adapted Joback Method)

Melting Point: 163.17 deg C (Gold and Ogle Method)

Mean Melt Pt : 239.86 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 193.85 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 474.11 deg C (estimated))

 (Using MP: 193.85 deg C (estimated))

   VP: 3.35E-013 mm Hg (Antoine Method)

     : 4.46E-011 Pa (Antoine Method)

   VP: 1.93E-011 mm Hg (Modified Grain Method)

     : 2.57E-009 Pa (Modified Grain Method)

   VP: 5.56E-009 mm Hg (Mackay Method)

     : 7.41E-007 Pa (Mackay Method)

 Selected VP: 1.93E-011 mm Hg (Modified Grain Method)

            : 2.57E-009 Pa (Modified Grain Method)

 Subcooled liquid VP: 1.14E-009 mm Hg (25 deg C, Mod-Grain method)

                    : 1.52E-007 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 18 | -CH2-            |  24.22 | 435.96

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 969.67

RESULT- corr | BOILING POINT in deg Kelvin | 747.27

            | BOILING POINT in deg C      | 474.11

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 18 | -CH2-            |  11.27 | 202.86

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 589.71

            | MELTING POINT in deg C      | 316.55

-------------------------------------------------------

 

 

Experimental Database Structure Match: no data

 

SMILES : CCCCCCCCC=CCCCCCCCC(=O)NCCO

CHEM  :C18'

MOL FOR: C20 H39 N1 O2

MOL WT : 325.54

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 477.68 deg C (Adapted Stein and Brown Method)

 

Melting Point: 311.47 deg C (Adapted Joback Method)

Melting Point: 165.26 deg C (Gold and Ogle Method)

Mean Melt Pt : 238.36 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 194.50 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 477.68 deg C (estimated))

 (Using MP: 194.50 deg C (estimated))

   VP: 2.25E-013 mm Hg (Antoine Method)

     : 2.99E-011 Pa (Antoine Method)

   VP: 1.47E-011 mm Hg (Modified Grain Method)

     : 1.97E-009 Pa (Modified Grain Method)

   VP: 4.46E-009 mm Hg (Mackay Method)

     : 5.94E-007 Pa (Mackay Method)

 Selected VP: 1.47E-011 mm Hg (Modified Grain Method)

            : 1.97E-009 Pa (Modified Grain Method)

 Subcooled liquid VP: 8.91E-010 mm Hg (25 deg C, Mod-Grain method)

                    : 1.19E-007 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 16 | -CH2-            |  24.22 | 387.52

 Group | 2 | =CH-             |  27.95 |  55.90

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 977.13

RESULT- corr | BOILING POINT in deg Kelvin | 750.84

            | BOILING POINT in deg C      | 477.68

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 16 | -CH2-            |  11.27 | 180.32

 Group | 2 | =CH-             |   8.73 |  17.46

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 584.63

            | MELTING POINT in deg C      | 311.47

-------------------------------------------------------

 

 

Experimental Database Structure Match: no data

 

SMILES : CCCCCC=CCC=CCCCCCCCC(=O)NCCO

CHEM  :C18''

MOL FOR: C20 H37 N1 O2

MOL WT : 323.52

------------------------ SUMMARY MPBPWIN v1.44 --------------------

 

 

Boiling Point: 481.26 deg C (Adapted Stein and Brown Method)

 

Melting Point: 306.39 deg C (Adapted Joback Method)

Melting Point: 167.34 deg C (Gold and Ogle Method)

Mean Melt Pt : 236.87 deg C (Joback; Gold,Ogle Methods)

 Selected MP: 195.15 deg C (Weighted Value)

 

Vapor Pressure Estimations (25 deg C):

 (Using BP: 481.26 deg C (estimated))

 (Using MP: 195.15 deg C (estimated))

   VP: 1.5E-013 mm Hg (Antoine Method)

     : 2E-011 Pa (Antoine Method)

   VP: 1.13E-011 mm Hg (Modified Grain Method)

     : 1.5E-009 Pa (Modified Grain Method)

   VP: 3.58E-009 mm Hg (Mackay Method)

     : 4.77E-007 Pa (Mackay Method)

 Selected VP: 1.13E-011 mm Hg (Modified Grain Method)

            : 1.5E-009 Pa (Modified Grain Method)

 Subcooled liquid VP: 6.95E-010 mm Hg (25 deg C, Mod-Grain method)

                    : 9.26E-008 Pa (25 deg C, Mod-Grain method)

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | BOIL DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  21.98 |  21.98

 Group | 14 | -CH2-            |  24.22 | 339.08

 Group | 4 | =CH-             |  27.95 | 111.80

 Group | 1 | -OH (primary)    |  88.46 |  88.46

 Group | 1 | -C(=O)NH-        | 225.09 | 225.09

  *  |    | Equation Constant |         | 198.18

=============+====================+==========+=========

RESULT-uncorr| BOILING POINT in deg Kelvin | 984.59

RESULT- corr | BOILING POINT in deg Kelvin | 754.42

            | BOILING POINT in deg C      | 481.26

-------------------------------------------------------

 

-------+-----+--------------------+----------+---------

 TYPE | NUM | MELT DESCRIPTION | COEFF  | VALUE 

-------+-----+--------------------+----------+---------

 Group | 1 | -CH3             |  -5.10 |  -5.10

 Group | 14 | -CH2-            |  11.27 | 157.78

 Group | 4 | =CH-             |   8.73 |  34.92

 Group | 1 | -OH (primary)    |  44.45 |  44.45

 Group | 1 | -C(=O)NH-        | 225.00 | 225.00

  *  |    | Equation Constant |         | 122.50

=============+====================+==========+=========

  RESULT   | MELTING POINT in deg Kelvin | 579.55

            | MELTING POINT in deg C      | 306.39

-------------------------------------------------------

Conclusions:
Using the Modified Grain method, of MPBPWIN v1.44 program of EPI SuiteTM, the weighted average VP value for test substance was predicted to be <1.34E-4 Pa at 25°C.
Executive summary:

The vapour pressure (VP) value for the test substance, C8-18 and 18-unsatd. MEA was predicted using the Modified Grain method of the MPBPWIN v1.44 program (EPI SuiteTMv4.11). Since the test substance is a UVCB, the VP values were predicted for the individual constituents using SMILES codes as the input parameter. Using the Modified Grain method, the VP values for the individual constituents of the test substance ranged from 1.13E-11 to 4.38E-05 Pa at 25°C (original estimates) (US EPA, 2019). Since not all constituents meet the boiling point (BP) and VP molecular descriptor domain criteria as defined in the MPBPVP user guide of EPI Suite TM, the VP predictions were considered to be less accurate. As the test substance is a UVCB, individual experimental BP values are not available to be used in order to reduce the uncertainty. However, for the VP parameter the chances of introducing errors when the predicted VP values were below the cut-off set by the tool, was reduced by substituting the individual VP values as less than the cut-off value (i.e., <1.34E-4 Pa). Further, given that the constituents are structurally very similar and vary only in the carbon chain length, a weighted average value, which considers the percentage of the constituent in the substance, was considered to dampen the errors in predictions (if any). Therefore, the weighted average VP value was calculated as <1.34E-4 Pa, indicating the test substance to have a low volatility potential (ECHA, 2017) and low fugacity (ECHA, 2009), leading to low inhalation exposure to users and environmental exposure through air or via volatilization from water. Overall, the VP predictions for the test substance using MPBPVP model of EPI Suite TM can be considered to be reliable with low to moderate confidence.

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Petryka, 2010). 

Weighted average vapour pressure values for the test substance were also modelled using the Modified Grain method of the MPBPWIN v1.44 program of EPI Suite and the Consensus method of the T.E.S.T. v4.2.1 program.

Key value for chemical safety assessment

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

Additional information

The measured vapour pressure was equivalent to 1.5E-5 Pa at 20°C.

Using the Modified Grain method of the MPBPWIN v1.44 program of EPI Suite, the weighted average vapour pressure for the test substance was predicted to be <1.34E-4 Pa at 25°C. According to the Consensus method of the T.E.S.T. v4.2.1 program, the weighted average vapour pressure was 1.92 E-3 Pa at 25°C. 

The measured vapour pressure was retained as key value for risk assessment purposes.