Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The overall persistence is a calculated term that allows the persistence of different chemicals to be compared using a single value. Even though the units of the overall persistence are the same as those used for a chemical's half-life (hrs), these two terms are not inter-convertible. The overall persistence takes into account both a chemical's media-specific half-lifeas well asits rate of transport into (and out of) that compartment. Because the overall persistence takes into account transport, its value will likely be different than any of the media-specific half-lives.

The overall persistence can only be calculated in a mass-balance multimedia model. These models calculate the overall persistence by determining the weighted average of the residence time in each compartment.

The overall persistence for Acetic acid, difluoro- is 16 days using the default emission scenario of the level III multimedia model. It has been estimated that Acetic acid, difluoro- is expected to be found predominantly in soil and its persistence estimate is based on its transformation in this medium. Its half-life in soil, 17 days, does not exceed the EPA criteria. Therefore, Acetic acid, difluoro- is estimated not to be persistent in the environment.

The estimation indicates that the substance is persistent in sediment by its potential for biodegradation in anaerobic (oxygen free) environment. Groundwater is also an anaerobic compartment. Chemicals may leach through soil and enter groundwater depending on their physical and chemical properties.