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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Link to relevant study record(s)

Reference
Endpoint:
toxicity to aquatic plants other than algae
Remarks:
Lemna
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
A read-across justification has been provided in Section 13.
Reason / purpose for cross-reference:
read-across source
Duration:
7 d
Dose descriptor:
IC50
Effect conc.:
803.39 mg/L
Nominal / measured:
meas. (geom. mean)
Conc. based on:
test mat.
Remarks:
CaF2
Basis for effect:
other: frond growth
Duration:
7 d
Dose descriptor:
IC50
Effect conc.:
1 337 mg/L
Nominal / measured:
meas. (geom. mean)
Conc. based on:
test mat.
Remarks:
CaF2
Basis for effect:
other: dry weight
Details on results:
Lemna is relatively insensitive to fluoride.
Results with reference substance (positive control):
Acceptable limits for control performance.
Validity criteria fulfilled:
yes
Conclusions:
Lemna minor was found to be relatviely insensitive to fluoride with an IC50 value (frond number) of 391 mg/L F. This relates to a IC50 of 803 mg CaF2/L.
Executive summary:

A 7 -day study was conducted on Lemna minor to assess the toxicity of fluoride in the presence of chloride and in hard water. Lemna minor was found to be relatively insensitive to fluoride with an IC50 value (frond number) of 391 mg/L F. This relates to 803 mg CaF2/L.

Description of key information

No studies are available for calcium fluoride. Available studies on fluoride were used as read-across source. Effective concentrations were recalculated taking in account the different molecular weight of the source and target substance.

A 7 -day study was conducted on Lemna minor to assess the toxicity of fluoride in the presence of chloride and in hard water. Lemna minor was found to be relatively insensitive to fluoride with an IC50 value (frond number) of 391 mg/L F. This relates to 803.39 mg CaF2/L.

Key value for chemical safety assessment

EC50 for freshwater plants:
803.39 mg/L

Additional information