Caesium sulphate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

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

Adequacy of study:

key study

Study period:

2012-10-09 to 2012-10-12

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP and guideline compliant. An experimental study was performed with a structural analogous read-across substance. Please refer to IUCLID section 13 for read-across justification.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

(2002)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

Version / remarks:

(2008)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2400 (Acute Eye Irritation)

Version / remarks:

(1998)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Caesium nitrate

EC Number:

232-146-8

EC Name:

Caesium nitrate

Cas Number:

7789-18-6

Molecular formula:

Cs.HNO3

IUPAC Name:

cesium nitrate

Test material form:

other: solid

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: S & K LAP Kft. 2173 Kartal, Császár út 135, HUNGARY
- Age at study initiation: Young adult rabbits
- Weight at study initiation: 2870-2925 g
- Housing: Animals were housed individually in metal cages.
- Diet: Fattening mixed diet, ad libitum
- Water: Tap water, ad libitum
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 ± 3 °C
- Humidity (%): 30 - 70 %
- Air changes (per hr): 9-12 changes/hour
- Photoperiod: Artificial light, from 6 a.m. to 6 p.m.

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: contralateral eye

Amount / concentration applied:

TEST MATERIAL
- Amount applied: 0. 1 g

Duration of treatment / exposure:

The eyelids were held closed gently for several seconds to prevent the loss of the test item. The contralateral eye served as control. Immediately after the administration of the test item, an assessment of the initial pain reaction was made according to the six point scale

Observation period (in vivo):

The eyes were examined at 1, 24, 48 and 72 hours after the application.

Number of animals or in vitro replicates:

3 animals

Details on study design:

REMOVAL OF TEST SUBSTANCE
None

SCORING SYSTEM: The eye irritation scores were evaluated according to the scoring system by Draize (1977) and OECD 405 (24th April 2002).

TOOL USED TO ASSESS SCORE: Hand-slit lamp

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

4

Results 3

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

4

Results 4

Irritation parameter:

iris score

Basis:

animal #1

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

2

Results 5

Irritation parameter:

iris score

Basis:

animal #2

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

2

Results 6

Irritation parameter:

iris score

Basis:

animal #3

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

2

Results 7

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #1

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 h

Results 8

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #2

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 h

Results 9

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #3

Time point:

other: 24, 48, 72 h

Score:

0.66

Max. score:

3

Reversibility:

fully reversible within: 72 h

Results 10

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 h

Results 11

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 h

Results 12

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 h

Results 13

Irritation parameter:

conjunctivae score

Remarks:

discharge

Basis:

animal #1

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 h

Results 14

Irritation parameter:

conjunctivae score

Remarks:

discharge

Basis:

animal #2

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 h

Results 15

Irritation parameter:

conjunctivae score

Remarks:

discharge

Basis:

animal #3

Time point:

other: 24, 48, 72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 h

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

No study on eye irritation with cesium sulphate is available. Consequently, read-across with cesium nitrate was performed. In conclusion, the test substance applied to the rabbits' eye mucosa, caused slight to severe conjunctival irritant effects, fully reversible within 72 hours and is thus not considered to be irritating to the eye. Accordingly, cesium sulphate is considered to have no irritating potential.

Executive summary:

No study on eye irritation with cesium sulphate is available. Consequently, read-across with cesium nitrate was performed. In an eye irritation test (in vivo) according to OECD No. 405 rabbits' eyes were examined at 1, 24, 48 and 72 hours after the application of the test item. One hour after the treatment, slight conjunctival redness, slight to moderate chemosis and slight to severe discharge were observed. 48 hours after the treatment, slight redness was recorded in one animal. Two animals became free of symptoms. 72 hours after treatment the study was terminated, as all animals were free of symptoms of irritation. In conclusion, the test substance applied to the rabbits' eye mucosa, caused slight to severe conjunctival irritant effects, fully reversible within 72 hours. Thus cesium nitrate is not considered to be irritating to the eye. Accordingly, cesium sulphate is considered to have no irritating potential.