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Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

The volatility of octanoic acid, zinc salt, basic is considered to be negligible.

Key value for chemical safety assessment

Additional information

The vapour pressure of a substance is defined as the saturation pressure above a solid or liquid substance. In EU method A.4, seven different measuring methods are listed for the measurement of the vapour pressure of solids and liquids. However, the vapour pressure does not need to be measured due to technical reasons if calculations indicate that the value is significantly less than 10-5 Pa. Octanoic acid, zinc salt, basic is a solid substance (salt of an organic acid and an inorganic cation) with a melting point of 133.5°C. In view of this, the volatility of this substance can therefore be safely assumed to be low. For purposes of comparison, the HSDB lists for the organic acid moiety a vapour pressure of 4.94 x 10-1 Pa (3.71x10-3 mm Hg) at 25°C for octanoic acid (Dauber and Danner, 1989). In consideration of the inorganic “salt” nature of this compound, it can therefore be anticipated that the vapour pressures of Octanoic acid, zinc salt, basic are well below the value for the organic acid, and thus negligible. Therefore, in accordance with Annex XI - section 1 & 2 of Regulation (EC) No 1907/2006, testing does not need to be conducted for technical as well as for scientific reasons.

[Daubert, T.E., R.P. Danner. Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. Washington, D.C.: Taylor and Francis, 1989.] **PEER REVIEWED** in Hazardous Substances Data Bank via TOXNET at http://toxnet.nlm.nih.gov