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EC number: 206-839-0 | CAS number: 381-73-7
Toxicological Summary
Administrative data
Workers - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.097 mg/m³
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 40
- Modified dose descriptor starting point:
- other: NOAEL
- Value:
- 3.879 mg/m³
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
Local effects
Long term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
Workers - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.055 mg/kg bw/day
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 40
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 2.2 mg/kg bw/day
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
Local effects
Long term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
Workers - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
Additional information - workers
Toxicity:
The toxicity and the metabolism ofdifluoroacetic acid has not been investigated in details and hence there is lack of literature on the same. However, after reading across from analogue chemicals dichloroacetic acid (DCA)and dibromoacetic acid (DBA), it is evident that DCA is eliminated at half the rate compared to DBA. This could be related to the reactivity of the halogens that decreases in the order fluorine > chlorine > bromine > iodine.
Thus, chlorine being more reactive than bromine is bound within the living system and eliminated out of the body slowly. Applying this rule, it shall follow thatdifluoroacetic acid shall be slowest in being eliminated out of the living system and thereby having a tendency to bio-accumulate. The chemical is also known to be a nephron-toxicantalthough the mechanism of DFA-induced nephrotoxicity is not understood.
Effect on skin :
As per the Annex VII column 2 of REACH regulation, the available information indicates that the substance difluoroacetic acid is a strong acid (pH ≤ 2.0). Also the substance is classified as very toxic in contact with skin and eyes. Thus testing for skin and eye irritation is not likely. Hence this endpoint was considered for waiver.
Sensitization :
As per the Annex VII column 2 of REACH regulation, the available information indicates that the substance difluoroacetic acid is a strong acid (pH ≤ 2.0).Thus testing for skin sensitisation is not likely. Hence this endpoint was considered for waiver.
General Population - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.024 mg/m³
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 80
- Modified dose descriptor starting point:
- other: NOAEL
- Value:
- 1.913 mg/m³
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
Local effects
Long term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
General Population - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.028 mg/kg bw/day
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 80
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 2.2 mg/kg bw/day
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
Local effects
Long term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
General Population - Hazard via oral route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.014 mg/kg bw/day
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 80
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 1.1 mg/kg bw/day
Acute/short term exposure
- Hazard assessment conclusion:
- no-threshold effect and/or no dose-response information available
- Most sensitive endpoint:
- repeated dose toxicity
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- DNEL extrapolated from long term DNEL
General Population - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- hazard unknown (no further information necessary)
Additional information - General Population
DNEL derivation
difluoroacetic acid does not exhibits acute toxicity in any of the 3 route of exposure that is oral, inhalation and dermal route and thus will be considered in acute toxic is not applicable.difluoroacetic acid was found to be corrosive to skin and eye, thus leading to a conclusion that the target will be corrovise to skin as well as eye. Available studies also indicate that the chemical does not exhibit genotoxicity and is not a reproductive toxin within the dose levels mentioned in the end points
In the absence of local effects following short-term or long-term exposure, no dose-response data are available and a quantitative dose descriptor is not derived. DNEL values for local exposure are therefore not calculated.
In the absence of acute systemic toxicity, no dose-response data are available and a quantitative dose descriptor is not derived. DNEL values for acute systemic effects are therefore not calculated.
A standard approach to deriving DNEL values would be to use the reproductive toxicity dataset and apply assessment factors as described in ECHA guidance documents. The critical endpoint is considered to be the NOAEL of 4.4 mg/kg bw/d in oral category.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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