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EC number: 254-052-6
CAS number: 38640-62-9
Bis(isopropyl)naphthalene (DIPN) is an isomeric
mixture, which consists of seven isomers (1,3-, 1,4-, 1,5-, 1,6-, 2,6-
and 2,7-DIPN). Bioaccumulation potential differs between the isomers.
According to OECD 305 the lipid normalized BCF values were determined to
range between 810 -2500 (low dose group; 0.47 µg/L)
and 2200-7800 (high dose group; 4.85 µg/L), respectively. Hence, some
isomers of bis(isopropyl)naphthalene fulfil the criterion of being
bioaccumualtive (BCF > 2000). Although the
environmental relevance of the results from the high exposure concentration
is questionable (see expert statement ECT, 2017) the highest measured
BCF value of 7800 was used as an worst case assumption for the
bioaccumulation assessment. Therefore, the isomeric mixture
bis(isopropyl)naphthalene (CAS 38640-62-9) was assessed as
bioaccumulative (B) and potentially very bioaccumulative (vB) under
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