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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Toxicological information

Specific investigations: other studies

Currently viewing:

Administrative data

Endpoint:
methaemoglobinaemia
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Scientifically acceptable data

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1970
Report date:
1970

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Acute toxicity study with cats. Single application: p.o.; Observation: 14 days, Additionally MetHb-Analysis was done.
GLP compliance:
no
Type of method:
in vivo
Endpoint addressed:
acute toxicity: oral

Test material

Constituent 1
Chemical structure
Reference substance name:
2-nitrophenol
EC Number:
201-857-5
EC Name:
2-nitrophenol
Cas Number:
88-75-5
Molecular formula:
C6H5NO3
IUPAC Name:
2-nitrophenol
Details on test material:
- Name of test material (as cited in study report): o-Nitrophenol
- Physical state: solid
no further data provided

Test animals

Species:
cat
Strain:
not specified
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Gewerbehyg.-Pharmakol. Institute of BASF
- Weight at study initiation: mean: males: 2.1kg; females: 2.0 kg

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
other: 2 and 10% aqueous suspension with traganth
Details on exposure:
VEHICLE
- Concentration in vehicle: 2.5 and 0.5%
Analytical verification of doses or concentrations:
not specified
Duration of treatment / exposure:
single treatment
Frequency of treatment:
once
Post exposure period:
7 days
Doses / concentrations
Remarks:
Doses / Concentrations:
50, 100, 250 mg/kg bw
Basis:
actual ingested
No. of animals per sex per dose:
2 cats each dose level (high and low dose group one male and one female cat, mid dose group two male animlas)
Control animals:
no

Examinations

Examinations:
- Determination of haemoglobin in blood with spectrophotometric method of Evelyn and Malloy.
- Toxic symptoms
- Necropsy of dead cats

Results and discussion

Details on results:
Clinical symptoms: 250 mg/kg bw: cyanosis, lateral position, atony, convulsions, increased respiration, yellow staining of the iris and ear tips (from the substance), one cat died after 2 days;
100 mg/kg bw: cyanosis
50 mg/kg bw: one animal showed increased respiration
Met-Hb:
250 mg/kg bw: up to 57% (4 h after exposure)
100 mg/kg bw: up to 44% (2 h after exposure)
50 mg/kg bw: up to 6% (2 h after exposure)

Met-Hb amounts were measured every two hours. After 24 hours all Met-Hb levels normalised again.

Necropsy of dead animal: urinary bladder was tightly filled with yellow-green-brownish urine (colour of substance). Necropsy of the other animals was not done.

Applicant's summary and conclusion

Conclusions:
Animals treated with 250 and 100 mg/kg bw via gavage showed an induction of Methaemoglobin after 2 hours of treatment. This substance induces Met-Hb production.