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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

At environmentally relevant pH, the substance exists almost entirely in the protonated form, methanethiol. Therefore, based

on the above information, data from studies with methanethiol or sodium methanethiolate are considered to represent both chemical species.

In a biodegradation assay according to OECD Guideline 301D, sodium methanethiolate was readily biodegradable, with 64% biodegradation after 21 days. Degradation of the compound met the 10-day window criterion (Thiebaud, 1995). This data is also representative of methanethiol behaviour and therefore methanethiol is considered as ready biodegradable.