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EC number: 813-845-2 | CAS number: 13780-04-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
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- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
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- Nanomaterial surface chemistry
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- Endpoint summary
- Stability
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- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
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- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
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- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
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- Specific investigations
- Exposure related observations in humans
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- Additional toxicological data

Acute Toxicity: oral
Administrative data
- Endpoint:
- acute toxicity: oral
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2013, January
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 013
- Report date:
- 2013
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
- GLP compliance:
- yes (incl. QA statement)
- Test type:
- acute toxic class method
- Limit test:
- no
Test material
- Reference substance name:
- Potassium Phosphonate KH2PO3/K2HPO3
- IUPAC Name:
- Potassium Phosphonate KH2PO3/K2HPO3
- Details on test material:
- Batch number :20111216-014Expiry date :16 December 2013Storage at RTC :Room temperatureCertificate of analysis:Supplied by the Sponsor and presented in Addendum ITest item characterisation :Not undertaken at the testing facility. The determination of the identity, strength, purity, composition, stability and method of synthesis and/or derivation of the test item was the responsibility of the SponsorSample archiving:Retained within RTC archives for a period of 10 years prior to disposal.
Constituent 1
Test animals
- Species:
- rat
- Strain:
- Sprague-Dawley
- Sex:
- female
- Details on test animals or test system and environmental conditions:
- Age and weight range :6 to 7 weeks old, 150 to 174 grams(at order) Supplier :Charles River Italia S.p.A., Calco (Lecco), ItalyBreeder :Charles River Italia S.p.A., Calco (Lecco), ItalyDate of arrival :17 January 2013Weight range at arrival:170 to 200 gramsAcclimatisation period:At least 5 daysVeterinary health check:After arrivalCagingNo. of animals/cage:Up to 3 during the study; up to 5 during acclimatisationHousing :Polysulphone solid bottomed cages measuring 59.5x38x20 cm with nesting materialCage tray control:Daily inspected and changed as necessary (at least 3 times/week)Water and dietWater :Drinking water supplied to each cage via a water bottleWater supply :Ad libitumDiet :4 RF 18 (Mucedola S.r.l., Via G. Galilei, 4, 20019, Settimo Milanese (MI) Italy)Diet supply :Ad libitum throughout the study except for dosing procedure indicated in section 4.2.2Records of analyses of water and diet are kept on file at RTC. Components present in the drinking water or diet are not at a level likely to interfere with the purpose or conduct of the study.Housing conditions (parameters set)Room lighting :Artificial (fluorescent tubes), daily light/dark cycle of 12/12 hours Air changes :Approximately 15 to 20 air changes per hour Temperature range:22°C ± 2°C Relative humidity range:55% ± 15% Actual conditions were monitored and recorded and records retained. No relevant deviations occurred.
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- water
- Details on oral exposure:
- As requested by the Sponsor, since similar substances were judged to be non toxic at that dose level, and for regulatory requirements related to the potential registration of the test item in some countries, the animals were treated at a maximum dose level of 5000 mg/kg. As indicated in OECD guideline no. 423, a first sub-group of one female animal was initially dosed at 5000 mg/kg (Step 1). Since mortality occurred in this animal, a lower dose level of 2000 mg/kg was investigated. Then, a first sub-group of 3 female animals was dosed at a level of 2000 mg/kg (Step 2). Mortality did not occur. A second sub-group, similarly composed, was then dosed at the same dose level (Step 3). No mortality occurred.No further doses were investigated since the objective of the study had been achieved.
- Doses:
- During the study, the test item was suspended as follows:Vehicle:Purified waterConcentration:500 and 200 mg/mLConcentrations were calculated and expressed in terms of test item corrected for purity (50%).Frequency of treatment:Once only, on the day of dosing (Day 1).Fasting procedure:Overnight prior to dosing (Day –1) up to 4 hours after dosing.Dose calculation:Dose volume of 10 mL/kg of body weight for each animal.
- No. of animals per sex per dose:
- 3 female for 5000 mg/kg5 female for 2000 mg/Kg
- Control animals:
- no
Results and discussion
- Preliminary study:
- Mortality occurred on Day 2 in the first animal initially dosed at 5000 mg/kg (Step 1). Clinical signs observed prior to death (on the day of dosing) were piloerection and reduced activity.
Effect levelsopen allclose all
- Sex:
- female
- Dose descriptor:
- LD0
- Effect level:
- > 2 000 mg/kg bw
- Based on:
- test mat.
- Sex:
- female
- Dose descriptor:
- LD50
- Effect level:
- > 2 000 mg/kg bw
- Based on:
- test mat.
- Mortality:
- No mortality occurred and no clinical signs were noted in the first sub-group of three animals dosed at 2000 mg/kg (Step 2). No mortality occurred and no clinical signs were seen in the second sub-group of three females (Step 3) treated at the same dose level
- Gross pathology:
- The necropsy examination performed in the decedent animal treated at 5000 mg/kg (Step 1) and, at the end of the observation period in the animals dosed at 2000 mg/kg (Steps 2 and 3), did not reveal external or internal alterations
Applicant's summary and conclusion
- Interpretation of results:
- Category 5 based on GHS criteria
- Remarks:
- No reason for classification according to EU criteria
- Conclusions:
- LD0 > 2000 mg/kg bwLD50 > 2000 mg/kg bw
- Executive summary:
The acute toxicity of KH2PO3/K2HPO3 was investigated following a single oral administration to the Sprague Dawley rat followed by a 14-day observation period.
A sub-group of 1 female animal was initially dosed at 5000 mg/kg (Step 1). Mortality occurred on Day 2 following dosing. Clinical signs observed prior to death were limited to piloerection and reduced activity.
No mortality occurred and no clinical signs were seen in the 2 sub-groups of animals subsequently dosed at 2000 mg/kg (Steps 2 and 3).
Body weight changes recorded during the study were within the expected range for this strain and age of animals.
No abnormalities were observed at necropsy examination performed in the early decedent animal or in those sacrificed at the end of the observation period.
These results indicate that the test item KH2PO3/K2HPO3 induced mortality in the rat following oral administration of a single dose at a level of 5000 mg/kg. No mortality or other signs of toxicity were observed following dosing at 2000 mg/kg. These results suggest the acute toxicity estimate (ATE) to be greater than 2000 but lower than 5000 mg/kg body weight.
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