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Environmental fate & pathways

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Based on data on a source substance (which is the racemic form of the registered substance, non-differentiated in HPLC condition), (±)-(3aR*,5aS*,9aS*,9bR*)-3a,6,6,9a-Tetramethyldodecahydronaphtho[2,1-b]furan , the adsorption coefficient (Koc) of the registered/target substance, (-)-(3aR,5aS,9aS,9bR)-3a,6,6,9a-Tetramethyldodecahydronaphtho[2,1-b]furan, can be determined at 5250, corresponding to a log Koc at 3.72. Based on structural similarity and common physico-chemical properties between these isomers, this source substance is considered adequate for read-across purposes (see IUCLID section 13 for justification). The result indicates that the registered substance is environmentally immobile in soils, according to P.J. McCall et al., 1980. Indeed, given the high log Kow value (5.09) and log Koc value, this is theoretically high adsorption to sewage sludge, which is then transferable to soil, and adsorption to sediment. However, according to the ready biodegradability study, much of the substance will already be biodegraded in the Sewage Treatment Plant (STP) prior to dispersion into the environment.

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