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Toxicological information

Acute Toxicity: inhalation

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Administrative data

Endpoint:
acute toxicity: inhalation
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
publication
Title:
The benzenediols: catechol, resorcinol and hydroquinone - a review of the industrial toxicology and current industrial exposure limits.
Author:
Flickinger, C.W.
Year:
1976
Bibliographic source:
American Industrial Hygiene Association Journal, 37:596-606.

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other:
Principles of method if other than guideline:
Data is from publication
GLP compliance:
not specified
Limit test:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report):resorcinol
- Substance type: Organic
- Physical state: Solid

Test animals

Species:
rat
Strain:
other: Harlan-Wistar
Sex:
female

Administration / exposure

Route of administration:
inhalation: aerosol
Type of inhalation exposure:
not specified
Vehicle:
other: water
Duration of exposure:
1 h
Concentrations:
At the 1 hour time interval, rats were exposed to concentrations of 7800 mg/m3 (57.4% weight/unit volume)(1732 ppm) and 2130 mg/mg3 (18.2% weight/unit volume) (473 ppm). It should be noted that in the study conducted at a concentration of 7800 mg/m3, the solution turned milky. And some precipitate was noted. It is likely that flow concentrations were less than the concentration indicated.
No. of animals per sex per dose:
12 (6 rats per dose)
Details on study design:
The acute toxic effects of resorcinol and phenol-water aerosols were investigated at comparable airborne concentrations.

Samples were dissolved in distilled water and the resulting solutions were aerosolized using a D18 Dautrebande aerosol generator operated at 30 psi. At this operating pressure, the D18 generator delivered droplets of 1µ or smaller. The concentration of the sample solutions was adjusted so that the airbourne concentration approximated 2,000 mg/m3 (444 ppm) of the sample in air. Airborne concentrations were determined by measurement of the volume loss of solution following aerosolization. The weight of sample present in that volume was then calculated and related to the total volume of air in generating the aerosol to obtain chamber concentrations. In groups of 6, rats, weighing between 87 and 126 g, were subjected to a single 1 hour inhalation period of the aerosolized sample.

At the 1 hour time interval, rats were exposed to concentrations of 7800 mg/m3 (57.4% weight/unit volume)(1732 ppm) and 2130 mg/mg3 (18.2% weight/unit volume) (473 ppm). It should be noted that in the study conducted at a concentration of 7800 mg/m3, the solution turned milky. And some precipitate was noted. It is likely that flow concentrations were less than the concentration indicated.

The animals were held for 14 days following exposure and were then weighed and sacrificed for gross necropsy.

Results and discussion

Effect levels
Sex:
female
Dose descriptor:
LC50
Effect level:
> 7 800 mg/m³ air
Based on:
test mat.
Exp. duration:
1 h
Mortality:
No deaths resulted when rats inhaled resorcinol-water aerosols for one-hour at concentrations of 2,130 mg/M3 (473 ppm) and approx 7,800 mg/M3 (1732 ppm) for a 1 hour period.
Body weight:
All animals had normal 14-day weight gains.
Gross pathology:
No lesions attributable to inhalation of the aerosol were seen at gross necropsy.

Applicant's summary and conclusion

Interpretation of results:
Toxicity Category III
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The Acute inhalation toxicity (LC50) value of resorcinol in Harlan-Wistar rats in 14 days observation period was observed at dose concentratio of 7,800 mg/m3 (1732 ppm).This value indicates that the substance resorcinol is toxic to rat in category 3
Executive summary:

The Acute inhalation toxicity (LC50) value of resorcinol in Harlan-Wistar rats in 14 days observation period was observed at dose concentratio of 7,800 mg/m3 (1732 ppm).This value indicates that the substance resorcinol is toxic to rat in category 3.