2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol

Acute Toxicity: inhalation

Administrative data

Endpoint:

acute toxicity: inhalation

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Acceptable study report with restrictions (only one test concentration, limited data on test material, no GLP)

Data source

Reference

Reference 1

Reference Type:

study report

Title:

Unnamed

Year:

1973

Report date:

1973

Reference 2

Reference Type:

other: Correspondence

Title:

Unnamed

Year:

1989

Report date:

1989

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 403 (Acute Inhalation Toxicity)

Deviations:

yes

Remarks:

(only one test concentration, limited data on test material)

GLP compliance:

no

Test type:

standard acute method

Test material

Test material information

Constituent 1

Reference substance name:

2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol

EC Number:

247-384-8

EC Name:

2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol

Cas Number:

25973-55-1

Molecular formula:

C22H29N3O

IUPAC Name:

2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)phenol

Test animals

Species:

rat

Strain:

other: Tif: RAIf

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: bred under SPF conditions in own breeding unit
- Age at study initiation: 8-9 weeks
- Weight at study initiation: 170-215 g
- Housing: male and females segregated in Macrolon cages, type 4(9 animals to a cage)

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22+/- 1
- Humidity (%): 50

Administration / exposure

Route of administration:

inhalation: aerosol

Type of inhalation exposure:

nose only

Vehicle:

other: ethanol

Details on inhalation exposure:

GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: modified version of an apparatus described by Niessen et al., Arch. Toxicol. 20, 44-60 (1963)
- Method of holding animals in test chamber: animals were kept in PVC tubes positioned radially around the exposure chamber.
- Source and rate of air: compressed air (2 atm)
- System of generating aerosols: The liquid was injected by a motor driven syringe at a rate of 60 ml/hr.
- Method of particle size determination: The particle-size distribution in the aerosol was determined gravimetrically on Selectron-Filters, pore size 0.2 ym (Schleicher and Schuell, 8714 Feldbach, Switzerland) every hour with the aid of a "Cascade Impactor" (CT. Casella and Co. Ltd., London N.l, England).

TEST ATMOSPHERE
- Brief description of analytical method used: The aerosol was sampled on membrane filters, pore size 0.2 µm (Sartorius, Göttingen, Germany) in the immidiate vincinity of the animals hourly after the beginning of the test. The concentration of TK-10046 was determined gravimetrically.
- Samples taken from breathing zone: yes

VEHICLE
- Concentration of test material in vehicle (if applicable): 20 %. The output of the spray device and the dimensions of the inhalation chamber are so adjusted to each other, that the solvent evaporates on the way from the nozzle orifice to the rat containers.

TEST ATMOSPHERE (if not tabulated)
- Particle size distribution: approximately 7.5 % > 7 µm, 5 % 3-7 µm, 55 % 1-3 µm, 32.5 % < 1 µm

Analytical verification of test atmosphere concentrations:

yes

Remarks:

gravimetric filter analysis

Duration of exposure:

4 h

Concentrations:

398 +/- 31 mg/m³, max. technically achievable concentration

No. of animals per sex per dose:

9

Control animals:

other: concurrent vehicle

Details on study design:

- Duration of observation period following administration: 7 days
- Frequency of observations: after 0-4 hrs, 24 hrs, 48 hrs, 7 days
- Frequency of weighing: before treatment; 5 min, 2 days, and 7 days after treatment
- Necropsy of survivors performed: yes

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LC50

Effect level:

> 0.4 mg/L air (analytical)

Based on:

test mat.

Exp. duration:

4 h

Remarks on result:

other: No mortality occured.

Mortality:

No mortality occured.

Clinical signs:

other: During the 4-hour exposure and the subsequent 7-day observation period no toxic symptoms were observed.

Body weight:

Body weight gains were within the normal ranges in males and females during the whole study period.

Gross pathology:

No substance related gross organ changes were seen.