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In accordance with OECD Guideline 121 (2001), an adsorpotion on soil and sewage sludge was carried out in a study via HPLC. As the substance is a multi-constituents substance containing three different components with different structures, rendering it not possible for one Log Koc for APE to be determined. Therefore, three individual Log Koc values were determined for each the sewage and soil samples.


 

























 Component Log Koc Sewage Log Koc Soil
 

Pentaerythritol diallylether


 1.8 1.7
 

Pentaerythritol triallyl ether


 2.8 2.7
 

Pentaerythritol tetraallyl ether


3.8  3.5

 


Additionally, according to Table R.7.1-14 of the ECHA Guidance on Information Requirements and Chemical Safety Assessment – Chapter R.7a: Endpoint specific guidance (Version 6.0, July 2017), the OECD 302B Guideline (Inherent biodegradability: Zahn-Wellens/EVPA Test) can be used to assess the extent of adsorption of the test substance to STP sludge. 


If significant apparent dissolved organic carbon (DOC) removal is shown to occur within the first 3-hours of the test, it is assumed that this removal has occurred too rapidly to have resulted from microbial degradation processes and it is instead assumed to be the result of a phase transfer from solution caused by adsorption (e.g. to walls of the test vessel and/or activated sludge inoculum). Adsorbed test substance will therefore be obscured from the analysis used to measure residual DOC in the test.


 


A reliable OECD 302B study is available for 1,3-propanediol, 2,2- bis(hydroxymethyl) -, allyl ether (Carlsson, 1997) which showed that there was no such DOC loss at 3-hours (or at any other point in the test), therefore it is concluded that 1,3-propanediol, 2,2- bis(hydroxymethyl) -, allyl ether does not have significant adsorption tendency.

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