Strontium hydroxide

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010-04-01 to 2010-04-22

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP guideline study reliable without restrictions

Cross-reference

Reason / purpose for cross-reference:

read-across: supporting information

Reference

Endpoint:

acute toxicity: oral

Type of information:

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

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH
Further information is included as attachment in Section 13.

Reason / purpose for cross-reference:

read-across source

Sex:

female

Dose descriptor:

LD50

Effect level:

> 828 mg/kg bw

Based on:

element

Remarks:

Sr

Interpretation of results:

GHS criteria not met

Conclusions:

Based on the read-across from Strontium nitrate, the oral LD50 value corresponds to > 1149 mg/kg body weight in Wistar rats for Strontium hydroxide.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Version / remarks:

, 2001-12-17

Deviations:

no

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Strontium nitrate

EC Number:

233-131-9

EC Name:

Strontium nitrate

Cas Number:

10042-76-9

Molecular formula:

Sr(NO3)2

IUPAC Name:

strontium dinitrate

Test material form:

solid: crystalline

Details on test material:

- Name of test material (as cited in study report): Strontium nitrate
- Molecular formula: Sr(NO3)2
- Molecular weight: 211.63
- Physical state: White crystals
- Stability under storage conditions: Stable
- Storage condition of test material: At room temperature in the dark
- pH (1% in water, indicative range): 6.4 - 7.0 (determined at NOTOX)
- Solubility in water (vehicle): Yes
No further information on the test material was stated.

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: Approx. 11-12 weeks old
- Weight at study initiation: 181 - 203 g
- Fasting period before study: Animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test substance. Water was available.
- Housing: Group housing of 3 animals per cage in labelled Macrolon cages (MIV type; height 18 cm.) containing sterilized sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France) and paper as cage-enrichment (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom).
- Diet (ad libitum): Pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany).
- Water (ad libitum): Tap water
- Acclimation period: At least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature: 21.0 ± 3.0ºC (actual range: 19.9 – 21.7ºC)
- Relative humidity: 40-70% (actual range: 34 - 53%)
- Air changes: Approximately 15 air changes per hour
- Photoperiod (hrs dark / hrs light): 12/12
No further information on the test animals was stated.

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

VEHICLE
- Justification for choice of vehicle: Water (Elix, Millipore S.A.S., Molsheim, France) was selected based on trial formulations performed at NOTOX and on test substance data supplied by the sponsor.

MAXIMUM DOSE VOLUME APPLIED: 10 ml/kg

DOSAGE PREPARATION: The formulations (w/) were prepared within 4 hours prior to dosing. Homogeneity was accomplished to a visually acceptable level.
No further information on the oral exposure was stated.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

Total: 6 female rats (Each dose group consisted of 3 animals.)

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Mortality/Viability was observed twice daily. The time of death was recorded as precisely as possible. body weights were measured on Days 1 (pre-administration), 8 and 15. Clinical signs were observed at periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15. The symptoms were graded according to fixed scales and the time of onset, degree and duration were
recorded:
Maximum grade 4: grading slight (1) to very severe (4)
Maximum grade 3: grading slight (1) to severe (3)
Maximum grade 1: presence is scored (1).
- Necropsy of survivors performed: Yes
The animals surviving to the end of the observation period were sacrificed by oxygen/carbon dioxide procedure. All animals assigned to the study were subjected to necropsy and descriptions of all internal macroscopic abnormalities recorded.
No further information on the study design was stated.

Statistics:

No statistical analysis was performed.

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

One female was found dead within 4 hours post-treatment on Day 1. No further mortality occurred.

Clinical signs:

other: Lethargy, hunched posture, piloerection and/or ptosis were noted for all animals and the surviving animals had recovered from all symptoms on Day 4 or Day 6. In addition to these symptoms, flat posture and slow breathing were observed for the animal that

Gross pathology:

Macroscopic post mortem examination of the animal that was found dead on Day 1 revealed several dark red foci on the glandular mucosa of the stomach. No abnormalities were found at macroscopic post mortem examination of the animals that survived until termination.

Other findings:

No data

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The oral LD50 value of Strontium Nitrate in Wistar rats was established to exceed 2000 mg/kg body weight.
According to the OECD 423 test guideline, the LD50 cut-off value was considered to be 2500 mg/kg body weight.
According to the Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures, strontium nitrate does not have to be classified and has no obligatory labelling requirement for oral toxicity.