5-amino-1,3-dihydro-2H-benzimidazol-2-one

Short-term toxicity to fish

Administrative data

Endpoint:

short-term toxicity to fish

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1988-11-08 to 1988-11-12

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: well performed guideline-study, but analytics is missing

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1988

Report date:

1988

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 203 (Fish, Acute Toxicity Test)

Deviations:

not specified

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

5-amino-1,3-dihydro-2H-benzimidazol-2-one

EC Number:

202-401-8

EC Name:

5-amino-1,3-dihydro-2H-benzimidazol-2-one

Cas Number:

95-23-8

Molecular formula:

C7H7N3O

IUPAC Name:

5-amino-1,3-dihydro-2H-benzimidazol-2-one

Details on test material:

The test item contains about 13 % water. Reason is that this compound is manufacturer and further processed only as water wet substance.
It is not expec ted that the additonal amount of water has an influence on the results.

Sampling and analysis

Analytical monitoring:

no

Test solutions

Vehicle:

no

Details on test solutions:

A homogenized solution of the test substance is mixed into the experimental basin. The test substance is settled down as brown substance on the floor of the fish tank. Concentrations refer to total mass of test substance added to the tank.

Test organisms

Test organisms (species):

Danio rerio (previous name: Brachydanio rerio)

Details on test organisms:

TEST ORGANISM
- Common name: Zebra danio
- Source: West Aquarium, 3422 Bad Lauterberg, Germany
- Length at study initiation (length definition, mean, range and SD): 2.8-3.1 cm, mean: 2.9 , sd: 0.11

- Feeding during test
- Food type: Tetra Min, Tetra Werke, Melle, Germany
- Amount/Frequency: 2 times daily, ad libitum



ACCLIMATION
- Acclimation period: 14 days
- Acclimation conditions (same as test or not): same as test, 22 +/- 1 °C

Study design

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

96 h

Test conditions

Test temperature:

See Table 1:

pH:

See Table 1:

Dissolved oxygen:

See Table 1:

Results and discussion

Effect concentrations

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

> 10 000 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: na

Any other information on results incl. tables

Sublethal observations / clinical signs:

Behaviour:

After 24 h the fishes showed a dark discolouration.

After 96 h some specimen showed sometimes increased swimming at the surface.

Applicant's summary and conclusion

Conclusions:

No lethality in group with substance concentration 10000 mg/l. No lethality in control group

Executive summary:

Test for short time toxicity for fish was performed according to OECD test method 203 and EC-method C1 on brachydanio rerio, no deviations from the described methods were observed. Method: static, limit test with concentration 10.000 mg/l .

The test substance Aminolon TF did not dissolve well under aquous conditions. At test concentration 10.000 mg/l, the substance formed a sediment at the bottom of the vessel. No analysis (neither quantitative nor qualitative) was performed for the dissolved amount of the substance.

Over 96 h no lethality was observed, neither in the concentration nor in the control group, the fishes in the concentration group showed altered behaviour.

Result: under short term conditions the substance is not toxic to fish at concentration >10.000 mg/l related to LC50.