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Environmental fate & pathways

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Strong bioaccumulation in aquatic organisms is unlikely for substances exhibiting a partition coefficient (logPow) < 4.5 or > 6. The logPow of 1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol (CAS 91648-65-6) was experimentally determined to be > 9.4 at 30 °C (Fox, 2012). The aquatic bioconcentration factor (BCF) of was predicted with the US-EPA software BCFBAF v3.01 (Chemservice S.A., 2013). The most relevant method, the regression-based one, revealed a BCF of 15.7 L/kg. This value indicates that strong bioaccumulation in aquatic organisms is unlikely.

Terrestrial bioaccumulation is no mandatory requirement under REACH and the chemical safety assessment indicates no need for further testing. Thus, the endpoint is fulfilled.