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EC number: 241-034-8 | CAS number: 16961-83-4
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to soil microorganisms
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Recent review of published work on fluoride ions.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The EU RAR summarises the results of a number of relevant studies
- GLP compliance:
- no
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material (migrated information):
Not relevant - Analytical monitoring:
- not specified
- Details on sampling:
- No details of sampling given in review.
- Vehicle:
- no
- Details on preparation and application of test substrate:
- No details on preparation and application of test substance given in the review.
- Test organisms (inoculum):
- soil
- Total exposure duration:
- 63 d
- Test temperature:
- Not stated
- Moisture:
- Not stated.
- Details on test conditions:
- No further details given in review
- Nominal and measured concentrations:
- not stated
- Reference substance (positive control):
- no
- Duration:
- 24 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 3 000 mg/kg soil dw
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Remarks:
- F-
- Basis for effect:
- other: Dehydrogenase inhibition
- Remarks on result:
- other: sodium fluoride
- Duration:
- 63 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 340 mg/kg soil dw
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Remarks:
- F-
- Basis for effect:
- other: NH4-minerilisation
- Remarks on result:
- other: potassium fluoride
- Duration:
- 63 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 106 mg/kg soil dw
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Remarks:
- F-
- Basis for effect:
- other: NO3-mineralisation
- Remarks on result:
- other: potassium fluoride
- Duration:
- 63 d
- Dose descriptor:
- NOEC
- Effect conc.:
- 1 060 mg/kg soil dw
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Remarks:
- F-
- Basis for effect:
- other: P-mineralisation
- Remarks on result:
- other: potassium fluoride
- Details on results:
- The NOEC values detailed in the report range from 106 to 3000 mg F-/kg dw. The 63 day experiments were carried out in a micro-ecosystem containing poplar litter (30% o.m) and the isopod Porcellio scaber Latr. Nitrification was found to be the most sensitive in the micro-ecosystem test.
- Executive summary:
The EU RAR reports NOEC values from 106 to 3000 mg F-/kg. The 63 day experiments were carried out in a micro-ecosystem containing poplar litter (30% o.m) and the isopod Porcellio scaber. Nitrification was found to be the most sensitive endpoint investigated in the micro-ecosystem test.
For conservative reasons the lowest NOEC, i.e., 106 mg F-/Kg dw will be used for the risk assessment.
Applying the conversion factor from F- to hexafluorosilicic acid, the NOEC corresponds to 133.6 mg hexafluorosilicic acid/kg.
Reference
Description of key information
NOEC: 133.6 mg hexafluorosilicic acid/kg.
Key value for chemical safety assessment
- Long-term EC10 or NOEC for soil microorganisms:
- 133.6 mg/kg soil dw
Additional information
The EU RAR reports NOEC values from 106 to 3000 mg F-/kg. The 63 day experiments were carried out in a micro-ecosystem containing poplar litter (30% o.m) and the isopodPorcellio scaber.Nitrification was found to be the most sensitive endpoint investigated in the micro-ecosystem test.
For conservative reasons the lowest NOEC, i.e., 106 mg F-/Kg dw will be used for the risk assessment.
Applying the conversion factor from F- to hexafluorosilicic acid, the NOEC corresponds to 133.6 mg hexafluorosilicic acid/kg.
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