Reaction mass of potassium difluoro{[2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate with potassiumfluoride and potassium carbonate

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Study period:

2009-03-09 to 2009-12-15

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The experimental study on the supporting substance is guideline-conform under GLP without deviations.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1200 (Acute Dermal Toxicity)

Deviations:

no

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

cC6O4 ammonium salt

IUPAC Name:

cC6O4 ammonium salt

Constituent 2

Reference substance name:

Acetic acid, 2,2-difluoro-2-[[2,2,4,5- tetrafluoro-5-(trifluoromethoxy)-1,3- dioxolan-4-yl]oxy]-, ammonium salt (1:1)

IUPAC Name:

Acetic acid, 2,2-difluoro-2-[[2,2,4,5- tetrafluoro-5-(trifluoromethoxy)-1,3- dioxolan-4-yl]oxy]-, ammonium salt (1:1)

Constituent 3

Reference substance name:

Reaction mass of ammonium difluoro {[(4S,5R)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate, ammonium difluoro {[(4R,5S)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate, ammonium difluoro {[(4S,5S)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate and ammonium difluoro {[(4R,5R)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate

EC Number:

682-238-0

Cas Number:

1190931-27-1

Molecular formula:

C6H4F9NO6

IUPAC Name:

Reaction mass of ammonium difluoro {[(4S,5R)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate, ammonium difluoro {[(4R,5S)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate, ammonium difluoro {[(4S,5S)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate and ammonium difluoro {[(4R,5R)-2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetate

Details on test material:

- Name of test material (as cited in study report): cC6O4 (DRY SALT)
- Molecular formula (if other than submission substance): C6H4F9NO6
- Molecular weight (if other than submission substance): 357
- Smiles notation (if other than submission substance): [NH4+].FC1(F)OC(F)(OC(F)(F)C([O-])=O)C(F)(OC(F)(F)F)O1
- InChl (if other than submission substance): no data
- Structural formula attached as image file (if other than submission substance): see Fig.1 (C6O4 Structural formula)
- Substance type: organic
- Physical state: Hygroscopic, off-white/cream, granules
- Analytical purity: 96.2% in terms of dry salt
- Impurities (identity and concentrations): NH4F=0.021% (w/w), NH4Cl=0.31% (w/w), H2O=0.328% (w/w), the organic impurities are dioxolan based and represent the 0.8% by mol on total mol of organic phase of sample
- Purity test date: not reported
- Lot/batch No.: 150/31
- Expiration date of the lot/batch: 31 December 2020
- Stability under test conditions: not reported
- Storage condition of test material: Ambient condition

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Italy S.r.l., 33049 San Pietro al Natisone (UD), Italy
- Age at study initiation: 6 to 8 weeks old
- Weight at study initiation: 183.7 to 194.1 grams
- Fasting period before study: Overnight prior to dosing (Day –1)
- Housing: Polycarbonate cages measuring 59x38.5x20 cm, with stainless steel mesh lid and floor
- Diet (e.g. ad libitum): 4 RF 18 ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: At least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22°C ± 2°C
- Humidity (%): 55% ± 15%
- Air changes (per hr): Approximately 15 to 25 air changes per hour
- Photoperiod (hrs dark / hrs light): Artificial (fluorescent tubes), daily light/dark cycle of 12/12 hours

IN-LIFE DATES: From: 2009-02-26 To: 2009-03-26

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

water

Details on dermal exposure:

TEST SITE
- Area of exposure: 2.5x2.5 cm
- % coverage: 10%
- Type of wrap if used: A strip of synthetic film was placed over the treated site and the whole assembly held in place by encircling the trunk of the animal with a length of elastic adhesive bandage, this forming a semi-occlusive barrier.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): The treatment area was cleaned by gentle swabbing of the skin with cotton wool soaked with lukewarm water.
- Time after start of exposure: 24 h

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 367.4 mg - 388.2 mg of dry salt
- Concentration (if solution): n.a.
- Constant volume or concentration used: yes
- For solids, paste formed: A volume of 0.5 ml or 1.0 ml of sterile water was added and mixed to a paste at the dosing procedure

VEHICLE
- Amount(s) applied (volume or weight with unit): 0.5 ml or 1.0 ml of sterile water
- Concentration (if solution): n.a.
- Lot/batch no. (if required): n.a.
- Purity: distilled water

Duration of exposure:

24 h

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

5

Control animals:

not required

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Allocation (Day-1), Days 1, 8 and 15.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight

Statistics:

no statistics applied

Results and discussion

Preliminary study:

not applicable

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

none observed

Clinical signs:

No systemic toxic effect were observed in male or female animals during the observation period. External examination of the treated site showed a slight oedema on Day 2 in all animals. Recovery from this sign occurred in all animals by Day 3. Desquamation of the treated skin was recorded in a single female from Day 3 to Day 7. Recovery occurred in this animal by Day 8.

Body weight:

A very slight body weight loss was recorded in a single female animal on Day 8 and in another female on Day 15. These losses are not believed to have any toxicological significance. Changes in body weight were within the expected range for this species and age of animal at the end of the study.

Gross pathology:

No abnormalities were found in any animals at necropsy performed at termination of the study.

Other findings:

none reported

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

These results indicate that the test item, cC6O4 ammonium salt, has no toxic effect on the rat following dermal exposure over a 24 hour period at a level of 2000 mg/kg. The lack of mortality demonstrates the LD50 to be greater than 2000 mg/kg.

Considering the similarity of chemical structure between cC6O4 ammonium salt and F-DIOX potassium salt, the same degree of acute toxicity of cC6O4 ammoium salt is expected for F-DIOX ammonium salt.

Executive summary:

In order to evaluate the potential dermal acute toxicityof F- Diox potassium salt it was deemed appropriate to use the Read Across approach based on the experimental study performed on cC6O4 ammonium salt by virtue of similarity of chemical structure between F- Diox potassium salt and cC6O4 ammonium salt (CAS no: 1190931-27-1).

 

F-Diox potassium salt and cC6O4 ammonium salt are two salts of the same carboxylic acid, they differ only for the cationic part (K+ in F-Diox potassium salt and NH4+ in cC6O4 ammonium salt). Considering the similarity of chemical structure a similar biological behaviour is expected.

The acute toxicity of cC6O4 ammonium salt was investigated following administration of a single dermal dose to the rat. No mortality occurred following dosing and no significant clinical signs were observed. These results indicate that the test item, cC6O4 ammonium salt, has no toxic effect on the rat following dermal exposure over a 24 hour period at a level of 2000 mg/kg. The lack of mortality demonstrates the LD50 to be greater than 2000 mg/kg. European Directives concerning the classification, packaging and labelling of dangerous substances and preparations (Regulation (EC) no. 1907/2006, 67/548/EEC and subsequent revisions) would indicate the following for cC6O4 ammonium salt:

Classification : Not required

Signal word : None indicated

Hazard statement : None indicated

Considering the similarity of chemical structure between cC6O4 ammonium salt and F-DIOX potassium salt above discussed, the same degree of dermal acute toxicity of cC6O4 ammonium salt is expected for F-DIOX potassium salt.