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Environmental fate & pathways

Biodegradation in soil

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According to REACh legislation, Annex IX, 9.2, column 2, studies on further biotic degradation do not need to be conducted if direct and indirect exposure of the water, sediment and soil compartments is unlikely. For the purpose of risk assessment, PNECs for hydrocarbon blocks incorporated into the PETRORISK model have been derived using aquatic PNECs and the equilibrium partitioning method (EqP). The outcome of the risk assessment with RCRs far below 1, i.e. regional RCRs of 3.6E-06 (freshwater), 1.4E-06 (freshwater sediment), 1.0E-08 (marine), 2.9E-09 (agricultural soil), 4.3E-10 (grassland (natural)) and local RCRs of 2.2E-02 to 9.0E-12 (effluent), 3.4E-02 to 6.9E-06 (freshwater), 3.4E-03 to 1.1E-08 (marine), 3.8E-02 to 7.9E-06 (freshwater sediment), 3.8E-03 to 4.0E-09 (marine sediment), 0.0E+00 (oral freshwater fish), 0.0E+00 (oral marine top predator), 4.7E-05 to 8.5E-09 (agricultural soil), 0.0E+00 (worm oral), do not indicate a risk to the environment (see localCSR and regionalCSR in PETRORISK spreadsheet attached in IUCLID section 13). Further, screening tests on biodegradation in water demonstrate that isoheptane is inherently biodegradable and shows the potential to degrade and disappear from the environment. Thus, isoheptane is not expected to persist in the environment under aerobic conditions and no further testing is required.