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Environmental fate & pathways

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Literature data exists on the bioaccumulation of soluble salts of light rare earth elements. Data on cerium nitrate can be used to provide an estimate of the bioaccumulation potential of cerium fluoride.

The study shows that some bioaccumulation of light rare earth elements can occur but that elimination processes reduce the bioaccumulation factors over a period of time.

The highest BCF value observed during the study for cerium was 804 in internal organs after 29 days and this reduced to 608 by the end of the study at 43 days.

The REACH criteria for PBT and vPvB as stated in Annex XIII give cut-off BCF values of 2000 and 5000 respectively and it is therefore considered reasonable to assume that cerium fluoride should not be considered to meet either of these criteria on the basis of the available data on an analogous substance. It is not considered necessary to undertake further bioaccumulation testing.