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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB
Justification:

A CO2 evolution test was used to assess the ready biodegradability in water. The test item attained0% biodegradation after 28 days and therefore cannot be considered to be readily biodegradable under the strict terms and conditions of OECD Guideline No. 301B. Care should be taken in the interpretation of the results due to the inhibitory nature of the test item to the activated sewage sludge micro-organisms used in the study. It should also be noted that the test substance is a UVCB containing multiple carbon chain components and as a consequence current biodegradation tests may not be appropriate.

Although the presence of ester bonds would suggest that the substances may be susceptible to hydrolysis, no degradation was apparent during a ready biodegradability study on BADGE-EDA, thereby suggesting that hydrolysis will not occur. Furthermore, available data on potential hydrolysis products (bisphenol A and the ethylene amines) have shown ready biodegradability providing supporting evidence of no hydrolysis.

The substances BADGE-EDA, BADGE-DETA and BADGE-TETA are considered to be inherently biodegradable.

A reliable (Klimisch 1), GLP experimental partition coefficient study using the HPLC method was conducted for BADGE-EDA according to the OECD Guideline No. 117 which showed log Pow values between 3.9 and 5.4 (95.9% of test item at 5.4), thereby indicating that BADGE-EDA is considered potentially bioaccumulative (B or vB). However, available shake-flask studies for BADGE-DETA and BADGE-TETA showed log Pow values of 0.704 and 0.292 respectively and therefore the substances are not considered potentially bioaccumulative (i.e. not B or vB). Read across to BADGE-EDA as the worst case is therefore appropriate.  

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