Reaction mass of sodium [2,4-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)][1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphtholato(2-)]chromate(1-) and sodium bis[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphtholato(2-)]chromate(1-) and sodium bis[2,4-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)]chromate(1-)

Endpoint summary

Description of key information

Oral:

In an acute oral toxicity study according to OECD Guideline 423 (acute toxicity class method) in rats (BASF Colors&Effects, 2017), an LD50 between 300 and 2000 mg/kg bw was determined.

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:

2016-08-29 to 2016-10-06

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Version / remarks:

2001-12-17

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Version / remarks:

(EC) No 440/2008, 2008-05_30

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1100 (Acute Oral Toxicity)

Version / remarks:

2002-12

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: Japan MAFF Testing Guideline of 12 Nousan No. 8147

Version / remarks:

2000-11-24

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

no

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Batch No. of test material: N01-131001
- Expiration date of the lot/batch: 2023-03-15

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature

OTHER SPECIFICS: Solid / dark brown

Species:

rat

Strain:

Wistar

Remarks:

Crl:WI (Han) SPF

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Wiga GmbH, Germany
- Females nulliparous and non-pregnant: yes
- Age at study initiation: ~ 10 weeks
- Weight at study initiation: 173 - 190 g
- Fasting period before study: at least 16 hours before administration, but water was available ad libitum.
- Housing: Single housing, in fully air-conditioned rooms, Makrolon cage, type III
- Diet: VRF1(P); SDS Special Diets Services, 67122 Altrip, Germany, ad libitum
- Water: Tap water, ad libitum
- Acclimation period: least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 3
- Humidity (%): 30 - 70
- Air changes (per hr): ~ 10
- Photoperiod (hrs dark / hrs light): 12/12

Route of administration:

oral: gavage

Vehicle:

corn oil

Remarks:

Ph.Eur.

Details on oral exposure:

VEHICLE:
- Concentration in vehicle: 20 g/100 mL (2000 mg/kg bw), 3 g/100 mL (300 mg/kg bw)
- Amount of vehicle: 10 mL/kg bw
- Justification for choice of vehicle: Good homogeneity of the test substance in corn oil Ph.Eur.

MAXIMUM DOSE VOLUME APPLIED:
10 mL/kg bw

DOSAGE PREPARATION:
The test item preparation for each test group was produced shortly before administration by stirring with a high speed homogenizer (Ultra-Turrax) and a magnetic stirrer.

CLASS METHOD:
Rationale for the selection of the starting dose: request of the sponsor

Doses:

1000 and 300 mg/kg bw

No. of animals per sex per dose:

3 females/dose

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Clinical signs for each animal were recorded several times on the day of administration and at least once during each workday thereafter. Individual body weights shortly before administration (day 0), weekly thereafter and on the last day of observation. In addition on the day of death starting with study day 1. A check for any dead or moribund animals was made at least once each workday.
- Necropsy of survivors performed: yes, necropsy with gross pathological examination was performed on the last day of the observation period after sacrifice by CO2-inhalation in a chamber with gradually increasing concentrations. Necropsy of all animals that died was performed as early as possible after death.

Statistics:

Calculations were performed using Microsoft Excel 2010 and checked with a calculator.

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 300 - < 2 000 mg/kg bw

Based on:

test mat.

Mortality:

In the single 2000 mg/kg bw test group all animals died at hour 5, day 1 or day 2 after administration, respectively.
No mortality occurred in both 300 mg/kg test groups.

Clinical signs:

other: Clinical signs in the single 2000 mg/kg test group revealed in all animals an impaired general state and piloerection at hour 4 or from hour 4 until hour 5 after administration. Additionally, one animal showed dyspnea at hour 4, while another animal showe

Gross pathology:

The following pathological findings were observed in the animals that died (2000 mg/kg bw test group, 3 females):
- Blackish discoloration of the stomach contents in all animals
- Gassed stomach in one animal
- Dark/blackish discolored liver in all animals
- Blackish discoloration of the small intestine's contents in one animal
There were no pathological findings in the animals sacrificed at the end of the observation period (6 females; both 300 mg/kg bw test groups).

Interpretation of results:

Category 4 based on GHS criteria

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

Dose descriptor:

LD50

Value:

300 mg/kg bw

Quality of whole database:

Klimisch code 1

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

Oral:

In an acute oral toxicity study performed according to the Acute Toxic Class Method (OECD Guideline 423), doses of 2000 or 300 mg/kg bw of the test substance in corn oil were sequentially administered by gavage to two test groups of three fasted Wistar rats each (3 females). All three animals of the 2000 mg/kg bw dose group died within 2 days. Following clinical signs were observed: Impaired general state, piloerection, diarrhea, one animal showed dyspnea. The following macroscopic pathologic findings were observed: Black discoloration of the stomach contents, dark/blackish discolored liver in all animals, blackish discoloration of the small intestine's contents in one animal, gassed stomach in one animal. No mortality occurred in both 300 mg/kg bw test groups. In the first group the animals showed impaired general state and piloerection. No clinical signs were observed in the second test group. The body weight of all surviving animals in both 300 mg/kg bw test groups increased throughout the study period within the normal range. There were no macroscopic pathological findings in the animals sacrificed at the end of the observation period (both 300 mg/kg bw. test groups, 6 females). The acute oral LD50 was calculated to be between 300 and 2000 mg/kg bw.

Justification for classification or non-classification

The available experimental test data are reliable and suitable for classification purposes under Regulation (EC) No 1272/2008.

As a result the substance is considered to be classified for acute oral toxicity (Category 4, H302) under Regulation (EC) No 1272/2008, as amended for the tenth time in Regulation (EU) No 2017/776.