Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
short-term toxicity to fish
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1988
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: study was carried out according to test guidline and under GLP-conditions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1988

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 203 (Fish, Acute Toxicity Test)
Qualifier:
according to guideline
Guideline:
EU Method C.1 (Acute Toxicity for Fish)
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
3-methyl-1-p-tolyl-5-pyrazolone
EC Number:
201-708-4
EC Name:
3-methyl-1-p-tolyl-5-pyrazolone
Cas Number:
86-92-0
Molecular formula:
C11H12N2O
IUPAC Name:
3-methyl-1-p-tolyl-5-pyrazolone

Test solutions

Details on test solutions:
aqueous solution of test substance with no precipitation observed

Test organisms

Test organisms (species):
Danio rerio (previous name: Brachydanio rerio)

Study design

Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
96 h

Test conditions

Test temperature:
21.2 - 23.0°C
pH:
7.1. -7.8
Dissolved oxygen:
7.0 - 8.9 mg/l
Nominal and measured concentrations:
0/25/35/50/71 mg/L (nominal)

Results and discussion

Effect concentrationsopen allclose all
Duration:
48 h
Dose descriptor:
LC0
Effect conc.:
35 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Duration:
96 h
Dose descriptor:
LC0
Effect conc.:
25 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Duration:
48 h
Dose descriptor:
LC50
Effect conc.:
>= 50 - <= 71 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Duration:
96 h
Dose descriptor:
LC50
Effect conc.:
43.3 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Duration:
48 h
Dose descriptor:
LC100
Effect conc.:
71 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Duration:
96 h
Dose descriptor:
LC100
Effect conc.:
71 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
1272/2008/EC: Acute aquatic toxicity: not acute toxic
Executive summary:

No lethality observed up to the obsevation group of 35 mg/L.

Symptoms observed in the 25 - 71 mg/L concentration group.