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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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In accordance with column 2 of REACh (Regulation (EC) No 1907/2006) Annex IX, the bioaccumulation study (required in section 9.3.2) does not need to be conducted as the substance is expected to have a low potential for bioaccumulation. Although the partition coefficient of the UVCB substance could also not be detremined experimentally, but modelling from the two main constituents was performed and lead to a log Kow of 1.75 for isophoronediamine (58%) and a log Kow of 6.44 was estimated for IPDA-BADGE-IPDA (31%). Taken into consideration that the modelling is related to the neutral molecules that only appear at pH 10 and above, due to the fact that IPDA-BADGE-IPDA is many times protonated at pH 7 (azote groups), the molecule will be then charged positively four times at neutral pH.

Therefore, given the low LogKow value for IPDA which was estimated to be 1.75 but known to be experimentally of 0.99 and the above mentioned data for IPDA-BADGE-IPDA, as well as the high molecular weight of the other constituents (>1000) which make the constituent not bioavalaible, the UVCB substance can be considered to be not Bioaccumulative.