Trisodium 5-[[5-[[4-chloro-6-[(3-sulphonatophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphonatophenyl]azo]-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-3-methanesulphonate

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1987

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1987

Report date:

1987

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

402-740-3

EC Name:

-

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Details on test material:

- Name of test material (as cited in study report): FAT 40'277/B
- Batch No.: Vers. 1367/87 UO
- Expiration date: August 1992
- Stability of test article: Stable
- Stability of test article dilution: stable for at least 2 hours

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Kleintierfarm Madoerin AG, CH 4414 Fuellinsdorf, / Switzerland
- Age at start of treatment: 8 to 9 weeks
- Weight at start of treatment: Males: 212 - 221 g, Females: 162-185 g
- Housing: Individually in Makrolon type-2 cages with standard softwood bedding ("Lignocel", Schill AG, 4132 Muttenz, Switzerland).
- Diet: Pelleted standard Kliba 343, Batch 77/87 rat maintenance diet ("Kliba", Klingentalmuehle AG, 4303 Kaiseraugst, Switzerland), available ad libitum.
- Water (e.g. ad libitum): Community tap water from Itingen, available ad libitum.
- Acclimation period: At least one week under laboratory conditions, after veterinary examination

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22±3
- Humidity (%): 40-70
- Air changes (per hr): 10-15
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Type of coverage:

occlusive

Vehicle:

CMC (carboxymethyl cellulose)

Remarks:

4% in distilled water

Details on dermal exposure:

Approximately 24 hours before treatment, the backs of the animals were shaved with an electric clipper, exposing an area of approximately 10 % of the total body surface. On test day 1, 4mL of the test article was applied evenly on the skin with a syringe and covered with an occlusive dressing. The dressing was wrapped around the abdomen and fixed with an elastic adhesive bandage. Twenty-four hours after the application, the dressing was removed. The treated skin was washed with lukewarm tap water and dried with disposable paper towels and the skin reaction was assessed according to the method of Noakes, D.N. and Sanderson, D.M. "A method for determining the dermal toxicity of pesticides". Brit. J. Industr. Med., 26, 59-64, 1969)

Duration of exposure:

24 hours

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Mortality/viability were measured four times during test day 1 and daily during days 2 - 15.
- Body weights were measured on day 1 (pre administration), 8 and 15.
- All animals were necropsied.
- Each animal had an examination for changes in appearance and behavior four times during day 1, and daily during days 2-15 (general behaviour, respiration, eye, nose, motility, body posture, motor susceptibility, skin)

Statistics:

The Logit model could not be applied to the observed rate of death. The toxicity was estimated without use of a statistical model.

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

0%

Clinical signs:

other: The rats showed yellowish discolored skin at the application site.

Gross pathology:

In two animals, several dark-red foci were observed in the lung.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The acute dermal toxicity of the test substance was estimated to be greater than 2000 mg/kg bw

Executive summary:

In a GLP compliant dermal toxicity study, performed according to OECD guideline 402, Wistar rats (5/sex) were exposed to the source substance (2000 mg/kg bw). The test substance was dissolved in a 4 % CMC solution and applied on the skin with a syringe and covered with an occlusive dressing for 24 hours. The treated skin was washed after 24 hours and a 14-day observation period followed. No mortality was observed during this period. Discoloration of the application area was observed. In two animals several dark-red foci present in the lung were observed. The toxicity of the test substance was estimated to be >2000 mg/kg bw.