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Description of key information

In an acute oral toxicity study in rats Toluene-4 -sulphonic acid was found to have an LD50 of 1410 mg/kg bw. The NOAEL is 1250 mg/kg/bw.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records
Reference
Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Aug 25 - Sept 27, 1988
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well described GLP compliant study conducted to recognized international test guidelines
Qualifier:
according to
Guideline:
OECD Guideline 401 (Acute Oral Toxicity)
Deviations:
no
Principles of method if other than guideline:
Males only; 5 animals per dose, a logarithmic series of single doses; mortality recorded through 14 days
GLP compliance:
yes
Test type:
standard acute method
Limit test:
no
Specific details on test material used for the study:

- Name of test material (as cited in study report): p-toluolsulfonsaure
- Substance type: organic
- Physical state: liquid
- Analytical purity: >98%
- Impurities (identity and concentrations): 0.3% H2SO4
- Composition of test material, percentage of components:
- Isomers composition: p-TS: ca 84.6%; m-TS: ca 4.6%; o-TS: ca 10.6%
- Purity test date: August 1, 1988
- Lot/batch No.: GPAD 185
- Expiration date of the lot/batch: not provided
- Stability under test conditions: stable
- Storage condition of test material: in the dark at 20 C
- Other:
Species:
rat
Strain:
Wistar
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Hoechst AG colony
- Age at study initiation: males - 7 weeks, females - 8 weeks
- Weight at study initiation: males - 194-202 g; females 181-196 g
- Fasting period before study: overnight
- Housing: in groups of 5
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: minimum of 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 +/- 3
- Humidity (%): 50 +/- 20
- Air changes (per hr): not provided
- Photoperiod (hrs dark / hrs light): 12 / 12

IN-LIFE DATES: From: August 25 To: September 27, 1988
Route of administration:
oral: gavage
Vehicle:
unchanged (no vehicle)
Details on oral exposure:
MAXIMUM DOSE VOLUME APPLIED: 10 mL/kg bw
Doses:
1250, 1600 and 2000 mg/kg for females; 2000 mg/kg for males
No. of animals per sex per dose:
5
Control animals:
no
Details on study design:
- Duration of observation period following administration: 28 days
- Frequency of observations and weighing: observations daily starting on day of exposure; body weight weekly
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, histopathology, other:
Statistics:
Probit analysis
Sex:
male/female
Dose descriptor:
LD50
Effect level:
ca. 1 410 mg/kg bw
Based on:
act. ingr.
Mortality:
2 of 5 males at 2000 mg/kg; 2 of 5, 3 of 5, and 4 of 5 females died at 1250, 1600 and 2000 mg/kg, respectively. Death almost always occurred within one day of dosing.
Clinical signs:
Main clinical signs were hypoactivity, hunched posture, irregular breathing in all animals at all doses on day 1 and then reversible within 3 days for males at 2000 mg/kg and within 2 days for females at 1250 mg/kg. For females at 1600 and 2000 mg/kg the symptoms were irreversible in 1 or 2 animals. Other clinical signs included abnormal gait, ptosis and piloerection in several animals from all doses on day 1 and then reversible within 2 days for males at 2000 mg/kg and females at 1250 mg/kg. For females at 1600 and 2000 mg/kg these symptoms were observed throughout the 28 day observation period.
Body weight:

At the end of 28-days, body weight increased in 2 of 3 males that survived. Increased in 2 of 3 surviving females exposed to 1250 mg/kg, and in 1 of 2 surviving females exposed to 1600 mg/kg. Body weight decreased in single surviving female exposed to 2000 mg/kg. Both increases and decreases at 28 days were at most and least +/- 27% of initial body weights.
Gross pathology:
Red discolouration of the GI tract filled with blood; white discouloration of the mucosa of the stomach and intestine; pale adrenals, stomach haemorrhages and abdomen filled with flied (in animals that died spontaneously). No sex specific differences.
Other findings:
NOAEL = 1250 mg/kg bw

Mortality: number of deaths at each dose: 2/5, 3/5 and 4/5 at 1250, 1600 and 2000 mg/kg for females, and 2/5 at 2000 mg/kg for males.

Time of death was Day 1 for all but one animal at 1600 mg/kg that died on day 13.

Clinical signs: hypoactivity, hunched posture, irregular breathing were observed in all animals from all dose groups on day 1 and was reversible within 3 days for males at 2000 mg/kg. For females, the above symptoms plus abnormal gait, ptosis and piloerection were seen in all animals at 1600 and 2000 mg/kg and were not reversible.

Necropsy findings: Red discolouration of the GI tract filled with blood, white discolouration of the mucosa of the stomach and intestine, pale adrenals, growing together of the stomach and nearby organs, stomach haemorrhages and abdomen filled with fluid (in animals that died).

Interpretation of results:
Category 4 based on GHS criteria
Remarks:
Migrated information Criteria used for interpretation of results: expert judgment
Conclusions:
The test substance has an acute oral LD50 of 1410 mg/kg bw. The NOAEL is 1250 mg/kg/bw.
Endpoint conclusion
Endpoint conclusion:
adverse effect observed
Dose descriptor:
LD50
Value:
1 410 mg/kg bw

Acute toxicity: via inhalation route

Endpoint conclusion
Endpoint conclusion:
no study available

Acute toxicity: via dermal route

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Justification for classification or non-classification