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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Data - Cr


Based on the EU RAR (2005), estimation methods for determining bioconcentration or bioaccumulation factors for fish, earthworms and uptake in the food chain are not applicable to chromium compounds. Instead, measured values are retrieved, reported and used in the EU RAR (2005).


Data allowed to conclude that bioconcentration factor for chromium (VI) in fish is relatively low at around 1 l/kg. Once in the organism, reduction of chromium (VI) to chromium (III) appears to occur, resulting in an accumulation of total chromium in the organisms to a factor of approximately 100 times the original concentration in water. Uptake of chromium (III)

directly from water is likely to be very low due to the limited water solubility and strong adsorption to sediment under most conditions found in the environment.


For the risk assessment, BCFs are calculated as:

a)    to estimate the concentration of chromium (VI) in fish: [Cr(VI)]fishmg/kg/ [Cr(VI)]watermg/l = BCFCr(VI) = 1 l/kg

b)   to estimate the concentration of chromium (III) in fish resulting from uptake and subsequent reduction of chromium (VI):

[Cr(III)]fishmg/kg / [Cr(VI)]watermg/kg = BCFCr(VI)-Cr(III) = 100 l/kg


As further reported in the EU RAR (2005), the uptake of chromium by aquatic organisms may be pH dependent, but there is insufficient information available to take possible BCF variations into account.