Residues (petroleum), distn. residue hydrogenation

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: This study report is classified as reliable with restrictions because it is an acceptable and a well-documented study report.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1982

Report date:

1982

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 401 (Acute Oral Toxicity)

GLP compliance:

yes

Test type:

other:

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

Vacuum residue (CAS # 64741-56-6)

IUPAC Name:

Vacuum residue (CAS # 64741-56-6)

Details on test material:

- Name of test material (as cited in study report): Vacuum Residuum (API 81-13) CAS No. 64741-56-6
- Substance type: Bitumen
- Physical state: Semi-solid (tar like)

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Breeding Laboratories, Inc., Portage, MI
- Age at study initiation: Approximately 7 weeks of age
- Weight at study initiation: 181 to 271 grams
- Fasting period before study: Overnight
- Housing: Group cages
- Diet (e.g. ad libitum): Ad libitum (continuous access to certified Purina rodent chow)
- Water (e.g. ad libitum): Ad libitum
- Acclimation period: At least 14 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 to 23
- Humidity (%): 32 to 64
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

corn oil

Details on oral exposure:

VEHICLE
- Concentration in vehicle: No data
- Amount of vehicle (if gavage): No data

MAXIMUM DOSE VOLUME APPLIED: 20 mL/kg body weight

Doses:

20 mL test material/kg body weight

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Weighing: initial day, day 7, and day 14. Observed hourly for the first 6 hours and then twice daily until day 14.
- Necropsy of survivors performed: Yes
- Other examinations performed: Clinical signs, body weight,gross necropsy

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 5 000 mg/kg bw

Mortality:

No mortality was observed.

Clinical signs:

other: Hypoactivity, diarrhea, dark brown and black anal region

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information LD50 is greater than 5000 mg/kg body weight; not classified under EU Dangerous Substances Directive 67/584/EEC Criteria used for interpretation of results: EU

Conclusions:

Under the conditions of this study, the oral LD50 was determined to be greater than 5000 mg/kg body weight in males and females. Vacuum Residuum is not classified under EU Dangerous Substances Directive 67/548/EEC.

Executive summary:

In an acute oral toxicity study, groups of fasted, Sprague-Dawley rats (5/sex) were given a single oral dose of Vacuum Residuum in corn oil at at a dose of 20 mL/kg body weight and observed for 14 days. Clinical observations include: hypoactivity, diarrhea, dark brown and black anal region. The oral LD50 was determined to be greater than 5000 mg/kd body weight in males and females.

 

This study received a Klimisch score of 2 and is classified as reliable with restrictions because it is an acceptable and a well-documented study report.