1-Hexanol, 2-ethyl-, manuf. of, by-products from, distn. residues

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:

1995-12-11 to 1996-01-19

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

The study was conducted according to the currently available guideline and according to GLP. However, a dispersion of the test item and not the water accommodated fraction was tested. The test substance concentration was not verified by analytical determination.

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1996

Report date:

1996

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method C.1 (Acute Toxicity for Fish)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 203 (Fish, Acute Toxicity Test)

Deviations:

no

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

1-Hexanol, 2-ethyl-, manuf. of, by-products from, distn. residues

EC Number:

271-832-1

EC Name:

1-Hexanol, 2-ethyl-, manuf. of, by-products from, distn. residues

Cas Number:

68609-68-7

Molecular formula:

UVCB, not applicable, see section 1.2 for information on constituents

IUPAC Name:

2,4-diethyl-3-propylpentane-1,5-diol; 2,4-diethyloctan-1-ol; 2-ethylhexan-1-ol; 2-ethylhexane-1,3-diol

Sampling and analysis

Analytical monitoring:

no

Test solutions

Vehicle:

no

Details on test solutions:

A stock solution (dispersion) was prepared. Then, the stock solution was disolved in the test tanks.

Test organisms

Test organisms (species):

Danio rerio (previous name: Brachydanio rerio)

Details on test organisms:

Brachydanio rerio, HAMILTON-BUCHANAN from the Zentral Toxikologie Hoechst AG, Kastengrund, Germany

Study design

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

96 h

Post exposure observation period:

No post exposure period

Test conditions

Hardness:

Not indicated

Test temperature:

21 - 23°C

pH:

7.8 - -8.2

Dissolved oxygen:

5.7 - 9.9 mg/L

Salinity:

Not indicated

Nominal and measured concentrations:

Nominal test concentration: 10, 22, 50 and 100 mg/L.

Details on test conditions:

TEST SYSTEM:
- 10 L test tanks
- 7 fishs per tank
- daily irradiation with 700 Lux for 12 hours /day
- No. of test tanks per concentration (replicates): 2
- The nominal concentrations tested were not verified by analytical determination.

EFFECT PARAMETERS MEASURED :
- observation of the behaviour of the fishs and its appearance
- counting of the fish lethality

Reference substance (positive control):

no

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

96 h

Dose descriptor:

LC0

Effect conc.:

22 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Effect concentrations 2

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

50 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Effect concentrations 3

Duration:

96 h

Dose descriptor:

LC100

Effect conc.:

100 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Details on results:

At all test concentrations an influence of the test substance on the behaviour of the fishs especially with respect to swimming and respiration was observed. In addition, an influence of the test substance concentration on the appearance of the fishs and behaviour was observed. No mortality was obsreved at 10 and 22 mg/L nominal concentration, whereas the mortality reached levels of 43% and 100 % at 50 and 100 mg/L. The effects are caused by the dissolved and undissolved parts of the test item in the test solutions. Undissolved test substance in the test solutions and a surface film was observed .

Results with reference substance (positive control):

Not applicable

Reported statistics and error estimates:

Not applicable

Any other information on results incl. tables

Sublethal observations / clinical signs:

Undissolved test substance in the test solutions and a surface film was observed . Therefore, the effects are caused by the dissolved and undissolved parts of the test item in the test solutions.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Remarks:

the effects are caused by the dissolved and undissolved parts of the test item in the test solutions

Conclusions:

1. 96h-LC0= 22 mg/L
2. 96h-LC50 = 50 mg/L
3. 96h-LC100 = 100 mg/L

Executive summary:

The study examined the effect of Montanol 800 on Zebrafish (Brachydanio rerio) for 96 hours. The fishs were exposed to nominal test concentrations of 10, 22, 50 and 100 mg/L. A dispersion of the test substance was tested and not the water accomodated fraction. The test substance concentration was not verified by analytical determination. Therefore, all results were related to the nominal concentration.

At all test concentrations an influence of the test substance on the behaviour of the fishs especially with respect to swimming and respiration was observed. In addition, an influence of the test substance concentration on the appearance of the fishs was observed. No mortality was observed at 10 and 22 mg/L nominal concentration, whereas the mortality reached levels of 43% and 100 % at 50 and 100 mg/L. The effects are caused by the dissolved and undissolved parts of the test item in the test solutions. Undissolved test substance in the test solutions and a surface film was observed .