Potassium triboron pentaoxide

Acute Toxicity: inhalation

Administrative data

Endpoint:

acute toxicity: inhalation

Type of information:

experimental study

Adequacy of study:

key study

Study period:

No data

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1997

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 403 (Acute Inhalation Toxicity)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: USEPA FIFRA 40 CFR Part 160

Deviations:

not specified

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Details on test material:

- Name of test material: Boric acid, Manufacturing Grade > 99 %
- Substance type: Solid
- Physical state: White poweder
- Analytical purity: >99 %
- Lot/batch No.: 7B10
- Stability under test conditions: Stable
- Other: Sample was ground in a ball mill for 24 h

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Ace Animlas Inc, Boyertown, PA
- Age at study initiation: Young adult
- Weight at study initiation: Males 205 - 255 g, females 179 - 208 g

Administration / exposure

Route of administration:

inhalation: dust

Type of inhalation exposure:

whole body

Vehicle:

other: unchanged (no vehicle)

Details on inhalation exposure:

TEST ATMOSPHERE
- MMAD (Mass median aerodynamic diameter) / GSD (Geometric st. dev.): MMAD 3.5 μm ± GSD 1.81 μm


CLASS METHOD
- Rationale for the selection of the starting concentration: ~ 2mg/L was the highest that was obtainable under the conditions of the test.

Analytical verification of test atmosphere concentrations:

not specified

Duration of exposure:

4 h

Concentrations:

Nominal concentration: 2000 mg/m3
Analytical concentration: 2120 ± 140 mg/m3

No. of animals per sex per dose:

5/sex/dose

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Necropsy of survivors performed: Yes
- Other examinations performed: Clinical signs

Statistics:

Not applicable - limit test

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LC50

Effect level:

> 2.12 mg/L air

Based on:

test mat.

Exp. duration:

4 h

Remarks on result:

other: This study was carried out at the request of the US EPA to confirm that the highest dose obtainable was 2 mg/L. It was deemed by the US EPA to be an acceptable study.

Mortality:

No deaths occurred

Clinical signs:

other: Animal observations were limited to the accumulation of test material on the walls of the exposure chamber. During the first 1.5 h of exposure, ocular and nasal discharge, hypoactivity and hunched posture were noted. Ocular discharge and/or nasal discha

Body weight:

No data

Gross pathology:

No specific findings observed, except red lung discolouration consistent with carbon dioxide inhalation caused by the euthanisation technique. All tissues and organs were normal.

Other findings:

No data

Applicant's summary and conclusion

Interpretation of results:

other: No data

Remarks:

Criteria used for interpretation of results: not specified

Conclusions:

The test was performed according to OECD Guideline 403. No deaths occurred. Animal observations were limited due to the accumulation of test material on the walls of the exposure chamber. During the first 1.5 h of exposure, ocular and nasal discharge, hypoactivity and hunched posture were noted. Ocular discharge and/or nasal discharge persisted in most animals after removal from the chamber. All animals recovered by day two after removal from the chamber.