Registration Dossier

Environmental fate & pathways

Hydrolysis

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Description of key information

Not applicable for charcoal.

Key value for chemical safety assessment

Additional information

Charcoal is not readily biodegradable and slightly soluble in water. In general terms hydrolysis is defined as the chemical transformation in which an organic molecule reacts with water. There are classes of chemicals that hydrolysis is the main pathway for their transformation in aquatic systems. The most common functional groups that are potentially susceptible to hydrolysis are: •Alkyl halides (RX) •Aliphatic and aromatic carboxylic acid esters (R1C(O)OR2) •Nitriles (RCN) •Epoxides •Amides (RC(ON)R1R2) •Carbamates (RC(O)NR1R2) •Sulfonic acid esters •Organophosphate esters (phosphoric and thiophosphoric acid esters) •Ureas The organic matter of charcoal consist of fixed carbon and volatile matter. Fixed carbon is the solid combustible residue that remains after a coal particle is heated and the volatile matter is expelled. The fixed-carbon content of a coal is determined by subtracting the percentages of moisture, volatile matter, and ash. The form of fixed carbon has no bonds or constituents (graphitised atoms of carbon) prone to hydrolysis. The volatile matter of charcoal contains constituents comprising Petroleum Hydrocarbon Gases Categories: C1-C4 hydrocarbons representing alkane and alkene structures (methane, ethane, ethylene, propane, propylene, n-butane, isobutane, 1,3-butadiene, isobutylene). C5-C6 hydrocarbons representing alkane, cycloalkane, alkene, cycloalkane, and aromatic structures (n-pentane, isopentane, cyclopentane, isopentene, cyclopentene, hexane, isohexane, cyclohexane, and benzene) as well as n-heptane, octane and aromatic hydrocarbons are well known as compound that resist to hydrolysis and characterized as stable into water (American Petroleum Institute Petroleum HPV Testing Group, submitted a Test Plan and Robust Summaries to EPA for the Petroleum Hydrocarbon Gases Category. As a result hydrolysis is not applicable for charcoal.