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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

If released into water, ethylviolet-cation is poorly biodegradable and acetate is readily biodegradable.

Key value for chemical safety assessment

Additional information

In water the test substance dissociates into the ethylviolet-cation and acetate.

Acetate is readly biodegradable.

The ethylviolet-cation has a triarylmethane structure. These structures are known to be poorly biodegradable: A BASF study with the highly similar analogue substance 1 according to OECD 301 E showed a DOC removal of 10 - 20% DOC in 28 days. Studies on the biodegradation of other triarylmethane dyes (Cha et al. 2001, Yatome et al. 1993) indicated that only minor parts of the C-backbone are susceptible to biodegradation. The low biodegradation potential of the test substance is confirmed in a catabol calculation for the ethylviolet-cation predicting 0 % degradtion in 28 d (BASF SE 2010).

The scientific literature as well as the QSAR calculation are therefore in good agreement with the BASF study.