Cobalt molybdate

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

29 Mar - 27 Apr 2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP - Guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

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

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

GLP compliance:

yes (incl. QA statement)

Remarks:

Secrétariat général du Groupe Interministeriel Des Produits Chimiques - DGCIS-SI - 12, rue Villiot, 75572 Paris cedex 12, France

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Cobalt molybdate

EC Number:

237-358-4

EC Name:

Cobalt molybdate

Cas Number:

13762-14-6

Molecular formula:

CoMoO4

IUPAC Name:

λ²-cobalt(2+) dioxomolybdenumbis(olate)

Details on test material:

- Name of test material (as cited in study report): cobalt molybdenum oxide
- Physical state: powder (light green)
- Analytical purity: > 99%
- Batch No.: EH 110005/1
- Expiration date of the lot/batch: June 2013
- Storage condition of test material: room temperature

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Elevage JANVIER (53940 Le Genest St Isle - France)
- Age at study initiation: 8 weeks
- Weight at study initiation: 180 - 201 g
- Fasting period before study: Food was removed at D-1 and then redistributed 4 h after test item administration
- Housing: by group of three in solid-bottomed clear polycarbonate cages with a stainless steel mesh lid; each cage contains sawdust bedding which was changed at least 2 times a week; each cage was installed in conventional air conditioned animal husbandry.
- Diet: ad libitum; M20-rat/mouse maintenance (made from the formulation EXTRALABO from PIETREMENT)
- Water: ad libitum; tap water from public distribution system (microbiological and chemical analyses carried out every six months by the IPL, Santé, Environnement Durables - Atlantique)
- Acclimation period: at least 5 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19-25
- Humidity (%): 30-70
- Air changes (per hr): approx. 15
- Photoperiod (hrs dark / hrs light): 12/12 (19:00 to 7:00)/(7:00-19:00)

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

other: distilled water

Details on oral exposure:

VEHICLE
- Amount of vehicle (if gavage): 10 mL/kg bw

DOSAGE PREPARATION:
In the first and second steps of the study, 300 mg of the test item was weighed and distilled water was added to a 10 mL volumetric flask. The preparation was magnetically stirred to obtain a battle-grey solution, just before the administration.
In the third and fourth steps of the study, 2000 mg of the test item was weighed and distilled water was added to 10 mL volumetric flask. The preparation was magnetically stirred to obtain a battle-grey solution, just before the administration.

Doses:

300 and 2000 mg/kg bw

No. of animals per sex per dose:

6 (3 animals each in two steps)

Control animals:

yes

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: clinical observations were carried out daily; body weights were determined on D0 (just before administering the test substance), D2, D7 and D14
- Necropsy of survivors performed: yes

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

2 500 mg/kg bw

Based on:

test mat.

Remarks on result:

other: LD50 cut-off according to OECD 423

Mortality:

300 mg/kg bw dose group: no mortality (0/6)
2000 mg/kg bw dose group: death of one rat during the second step of the study on Day 6 (1/6)

2000 mg/kg bw
2 of 6 animals found dead during the study: one animal from step 1 died at 28 hours 55 minutes post-dose and one animal from step 2 died at 21 hours post-dose.

Clinical signs:

other: 300 mg/kg bw dose group: no clinical signs related to the administration of the test item were observed. 2000 mg/kg bw dose group: animal found dead (1/6): a decrease in spontaneous activity and piloerection on Day 5 surviving animals (5/6): a decrease i

Gross pathology:

300 mg/kg bw dose group: The macroscopical examination of the animals at the end of the study did not reveal treatment-related changes.
2000 mg/kg bw dose group:
animal found dead (1/6): The macroscopical examination of the dead animal revealed a thinning of forestomach and corpus; a red thickening of the distal part of the forestomach and red/greenish coloration of corpus, black liquid in the caecum and bright red coloration of the lungs.
surviving animals (5/6): The macroscopical examination of the animals at the end of the study did not reveal treatment-related changes.

Any other information on results incl. tables

Table 1 

Dose [mg/kg bw]	Toxicological results*	Duration of clinical signs	Time of death	Mortality (%)
Females
300	0/0/6	---	---	0
2000	1/2/6	Day 5 – Day 6	Day 6	16.7
LD50 = 2500 mg/kg bw (LD50 cut off-according to OECD 423)

* first number = number of dead animals                                   

 second number = number of animals with clinical signs           

 third number = number of animals used                                 

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

CLP: not classified
DSD: not classified