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Environmental fate & pathways

Adsorption / desorption

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Description of key information

In accordance with section 1 of REACH (Regulation (EC) No 1907/2006) Annex XI the adsorbtion/desorption test (required in section 9.3.1) and further information on adsorption/desorption (required in section 9.3.3) are not proposed by the registrant as the substance is a gas at ambient conditions expected to primarly and rapidly distribute to atmosphere. Hence, due to the gaseous nature of the substance and its partition to the atmosphere, as well as the consequent difficulty to appropriately test PMVE and provide meaningful results, no testing is proposed for this endpoint.
The estimated Koc value of PMVE (KOCWIN model , v.2.0, EPI Suite v 4.0) is Koc = 96.38 L/Kg (estimated from MCI) and Koc = 41.68 L/Kg (estimated from log Kow) indicating that the potential adsorption of PMVE to soil and sediment is expected to be low.

Key value for chemical safety assessment

Koc at 20 °C:
96.38

Additional information

PMVE is a gas at ambient conditions which is expected to primarly and rapidly distribute to atmosphere in case of releases. 

Due to the gaseous nature of the substance and its partition to the atmosphere, as well as the consequent difficulty to appropriately test PMVE and provide meaningful results, no experimental data are reported for this endpoint. However, in order to evaluate the soil adsorption hazard profile of PMVE despite the fact that it is expected to rapidly partition to the atmosphere compartment,aQuantitative Structure Activity Relationships (QSARs)assessmenthas been applied.

The estimated Koc value of PMVE (KOCWIN model ,v.2.0, EPI Suite v 4.0) isKoc = 96.38 L/Kg (estimatedfrom MCI) and Koc = 41.68 L/Kg (estimated from log Kow) indicating that the potential adsorption of PMVE to soil and sediment is expected to be low.

In fact, as indicated in the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7a: Endpoint Specific Guidance, Appendix R.7.1.15 (Adsorption/Desorption), substances with a Koc below 500 -1,000 L/Kg are generally unlikely to adsorb to sediment.

[LogKoc: 1.98]