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Hydrolysis

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According to Guidance on information requirements and chemical safety assessment - Chapter R.7b: Endpoint specific guidance hydrolysis is defined as a decomposition or degradation of a chemical by reaction with water and is designed to provide information on abiotic degradation that can help in classification, persistence testing and in determining the fate of a substance in environmental surface waters. Hydrolysis is a common degradation route in the environment, where reaction of a substance with water with a net exchange of the X group with an OH at the reaction centre such that RX + H2O → ROH + HX. 
Sulphuric acid, compound with graphite is an inorganic solid, consisting of natural graphite and variable amounts of intercalated sulphuric acid.
Sulphuric acid, compound with graphite does not contain water sensitive chemical bonds/groups that would suggest the ability to hydrolyse. The main component graphite does not undergo hydrolysis. The incorporated sulphuric acid is partially leached out by water and dissociates into the environmentally ubiquitous sulphate (SO42-) and hydronium (H3O+) ions. These ions cannot hydrolyse anymore.
Based on the chemical structure of sulphuric acid compound with graphite, degradation via hydrolysis is unlikely to occur and performance of a study to determine hydrolysis is considered to be scientifically not justified.

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