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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

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The components of DVB-55 and DVB-HP are only slightly soluble in water (44 mg/L), have moderate vapor pressure (ca. 50 Pa at 20°C), and have moderate log Kow (3.80). Therefore, both volatilization from water, and partitioning to soil/sediment, are important processes affecting their environmental distribution. The DVB-55 substance has shown little or no biodegradation in biodegradation screening tests. A biodegradation simulation study in water/sediment microcosms demonstrates rapid dissipation of DVB/EVB with DT50 from 3.8 to 31.4 days and the formation of more polar metabolites. Mineralization of [14C]1,3 EVB to14CO2 reached 19.8 and 67.7% of applied radioactivity within 49 days at 50 and 500 µg/L, respectively. In microcosms that did not contain sediment, mineralisation was minimal (3%).

Measured fish BCF values in Cyprinus carpio for a representative reaction mass substance (57.0% of DVB; 37% EVB) were < 453 L/kg wet wt. A mid-point BCF value of 320 L/Kg (wet wt.) is used for the chemical safety assessment.

The bioconcentration potential (bioconcentration factor, BCF) of the four major constituents in divinylbenzene (DVB-55) have been assessed using a quantitative structure-activity relationship (QSAR) model (BCF baseline model v.02.06) as described by Dimitrov et al (2005) and implemented in OASIS CATALOGIC v 5.11.12. Constituents of DVB-55 are not bioaccumulative with high confidence, as BCF values range from 219 and 302 L/kg.

The QSAR predictions are within the same range, as measured in Carp, which is chosen as a key value for the chemical safety assessment.