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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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The biodegradation is defined as the biologically mediated degradation or transformation of chemicals usually carried out by microorganisms. (Guidance on information requirements and chemical safety assessment - Chapter R.7b: Endpoint specific guidance)
According to column 2 of Annex IX (standard information requirements for substances manufactured or imported in quantities of 100 tonnes or more) of Regulation (EC) No 1907/2006 a simulation study on biodegradation in sediment does not need to be conducted if direct and indirect exposure of sediment is unlikely.
Sulphuric acid, compound with graphite is an inorganic solid, consisting of natural graphite and variable amounts of intercalated sulphuric acid.
Graphite is a naturally occurring solid substance which is insoluble in water. Due to its physico-chemical properties it is not systemically and biologically available and does not cross biological membranes. In the aquatic compartment it can be considered as an inert substance.
Biologically mediated degradation or transformation of graphite carried out by microorganisms is therefore unlikely to occur.
Given the inherent properties of sulphuric acid, compound with graphite and the unlikelihood of exposure of sediment to sulphuric acid, compound with graphite, testing of biodegradation is considered not to be necessary and is not required under Regulation (EC) No 1907/2006 (REACH).

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