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Environmental fate & pathways

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1,4-Dimethyl-2-(1-phenylethyl)benzene was tested in a flow-through system in accordance with OECD Test Guideline 305 for 42 days with two concentration levels (1 ppb and 0.1 ppb). A stock solution used in the test was prepared without dispersant but direct dissolution in the test water. BCF values at steady state were determined as 540 for the higher and 620 for the lower concentration level.

In addition, data is available from a reliable QSAR model.

Bioaccumulation of 1,1’-DPE is not expected since the criterion for considering substances as being not bioaccumulative (i.e. unlikely to havea BCF > 2,000) are met as can be derived from BCF calculation: The BCF of 325 to 420 for 1,1’-DPE fits well within the lower range of calculated values for BCF. As can be expected a clear correlation exists between molecular weight and the BCF. No further testing is required.

For detailed read across rationale and justification see section 13, Read across document.