Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Because naphthenic acid is a mixture of many different isomers of cycloalkyl carboxylic acids the rate of biodegradation strongly varies depending upon the composition of the complex mixture. Available data on both model and commercially available naphthenic acids however show that biodegradation occurs. Furthermore the data suggest that the microbial degradation is the predominant factor in the reduction of aquatic acute toxicity of naphthenic acids. A number of relevant scientific journal articles show that naphthenic acid is inherently biodegradable. QSAR results for the acidic fraction support the ready (for some components) and inherent biodegradation that was shown in these biodegradation studies. The hydrocarbon fraction (non-acidic) can be characterized as a kerosene or diesel, which have a very similar composition. Read across from kerosene to diesel seems therefore appropriate (Concawe, 2010*). Based on compositional information available and measured or predicted data on key constituents, kerosenes are not expected to meet the criteria for ready degradability but are inherently biodegradable (Concawe, 2010). Hence the non-acidic fraction of naphthenic acids can be considered to be inherently biodegradable.

* CONCAWE. Hazard classification and labelling of petroleum substances in the European Economic Area – 2010