Registration Dossier
Registration Dossier
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EC number: 231-154-9 | CAS number: 7440-45-1
Endpoint summary
Administrative data
Description of key information
Additional information
Endpoint Study Summary:
Specie
|
Test substance |
Conc. in environment |
BCF |
Comments |
Reference |
Eichhornia crassipes(aquatic plant) |
Ce(NO3)3 |
0,4 mg/L (ppm) |
> 2,9 - < 6,4 |
Steady state (21 d). Measured in roots, stems and leafs |
Chua H, 1998 |
Unio praesidens(clam) |
Ce |
200 ppm |
30,74 (soft part) 4,3 (shell) |
Steady state (5 d) |
El-Shinawy, 1987 |
|
|
400 ppm |
5,65 (soft part) 1,14 (shell) |
Steady state (5 d) |
El-Shinawy, 1987 |
Roccus saxatilus(bass) |
CeCl3 |
0,18 µg/L |
< 20 |
|
Carpenter JH, 1967 |
Crassostrea virginica(oyster) |
CeCl3 |
0,18 µg/L |
60 |
|
Carpenter JH, 1967 |
Mya arenaria(clam)
|
CeCl3 |
0,18 µg/L |
1000 |
|
Carpenter JH, 1967 |
· El-Shinawy et al. reports that cerium is lowest accumulated in the soft part and shell of the clam Unio praesidens in comparison to cobalt or zinc.
· Carpenter et al. reports a BCF of 1000 for the soft clam Mya arenaria. However, the precarious description of the experiment set up does not allow a reliable interpretation of the results.
· The results are too divergent to confirm per weight of evidence that “Although cerium may bioaccumulate in aquatic organisms, there is no evidence that it may become magnified along food chains due to the low bioaccumulation factors”. However, in general Ce bioaccumulation seems to be relatively low and the BCF observed for the clam Mya arenaria may not be representative of other bivalves or aquatic organisms.
Observations of the cerium content in natural waters may be of relevance due to the accumulation of cerium radioisotopes. Radioactive cerium enters the marine environment through world wide fallout and effluent discharged from reprocessing of the irradiated fuels (Borkar et.al, 1979). However, this is not an intended use identified in this registration. Cerium is being registered here for alloying purposes. According to the type of articles into which cerium is eventually processed (see uses section) no exposure in the aquatic compartment is expected.
Therefore, “direct and indirect exposure of the aquatic compartment is unlikely" and this endpoint can be waived.
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