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Environmental fate & pathways

Henry's Law constant

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Description of key information

From the water surface the substance will not evaporate into the atmosphere. 

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.36
at the temperature of:
25 °C

Additional information

QSAR-disclaimer

In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met.

 

According to Annex XI of Regulation (EC) No 1907/2006 (Q)SAR results can be used if (1) the scientific validity of the (Q)SAR model has been established, (2) the substance falls within the applicability domain of the (Q)SAR model, (3) the results are adequate for the purpose of classification and labeling and/or risk assessment and (4) adequate and reliable documentation of the applied method is provided.

 

For the assessment of DL-Alpha-Tocopherol (CAS 10191 -41 -0) (Q)SAR results were used for the estimation of the Henry’s Law constant. The criteria listed in Annex XI of Regulation (EC) No 1907/2006 are considered to be adequately fulfilled and therefore the endpoint(s) sufficiently covered and suitable for risk assessment.

Therefore, further experimental studies on the Henry’s Law Constant are not provided.

 

Assessment

No experimental data are available, therefore the Henry's Law constant (HLC) was calculated using the bond estimation method of HENRYWIN v3.20 (EPISuite v 4.11; BASF SE 2017) to be 0.36 Pa*m³/mol. These estimations refer to the uncharged molecule. The substance was not within the applicability domain of the model since the maximum number of occurrence of three bonds was exceeded by the substance. Therefore, the estimate may be less accurate. However, as the bond estimation method is regarded to be a reliable estimation method, the result is used in the assessment of DL-Alpha-Tocopherol.

In conclusion, based on the calculated data, the substance is not expected to evaporate into the atmosphere from the water surface.