1,1'-azobis(1-cyclohexanecarbonitrile)

Short-term toxicity to aquatic invertebrates

Administrative data

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

4.-7.12.18

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Version / remarks:

2004

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

1,1'-azobis(1-cyclohexanecarbonitrile)

EC Number:

218-254-8

EC Name:

1,1'-azobis(1-cyclohexanecarbonitrile)

Cas Number:

2094-98-6

Molecular formula:

C14H20N4

IUPAC Name:

1,1'-azobis(1-cyclohexanecarbonitrile)

Test material form:

solid: granular

Sampling and analysis

Analytical monitoring:

yes

Test solutions

Vehicle:

no

Test organisms

Test organisms (species):

Daphnia magna

Details on test organisms:

TEST ORGANISM
- Common name: Daphnia magna
- Strain/clone: STRAUSS
- Justification for species other than prescribed by test guideline:
- Age at study initiation (mean and range, SD): between 0 and 24 hours
- Weight at study initiation (mean and range, SD):
- Length at study initiation (length definition, mean, range and SD):
- Stage and instar at study initiation:
- Valve height at study initiation, for shell deposition study (mean and range, SD):
- Peripheral shell growth removed prior to test initiation:
- Method of breeding:
- Source: Berlin
- Age of parental stock (mean and range, SD):
- Feeding during test
- Food type:
- Amount:
- Frequency:

ACCLIMATION
- Acclimation period:
- Acclimation conditions (same as test or not):
- Type and amount of food:
- Feeding frequency:
- Health during acclimation (any mortality observed):

QUARANTINE (wild caught)
- Duration: -
- Health/mortality: -

METHOD FOR PREPARATION AND COLLECTION OF EARLY INSTARS OR OTHER LIFE STAGES, INCLUDING CULTURING CONDITIONS:

Study design

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

48 h

Test conditions

Hardness:

2.502 mmol/L
250 mg CaCO3/L

Test temperature:

19.7 – 20.3 °C

pH:

7.7-7.8

Dissolved oxygen:

8.5-8.9 mg O2/L

Nominal and measured concentrations:

100 mg/L (nominal)
2.54 mg/L (geometric mean)

Details on test conditions:

TEST SYSTEM
- Test vessel: glass beakers, nominal volume 50 mL, tall shape
- Type (delete if not applicable): open / closed
- Material, size, headspace, fill volume: 20 ± 5 mL test solution
- Volume of solution:
- Aeration:
- Type of flow-through (e.g. peristaltic or proportional diluter):
- Renewal rate of test solution (frequency/flow rate): none
- No. of organisms per vessel: 5 daphnia
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4
- No. of vessels per vehicle control (replicates): -
- Biomass loading rate: -

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water:
- Total organic carbon:
- Particulate matter:
- Metals:
- Pesticides:
- Chlorine:
- Alkalinity:
- Ca/mg ratio:
- Conductivity:
- Salinity:
- Culture medium different from test medium:
- Intervals of water quality measurement:

OTHER TEST CONDITIONS
- Adjustment of pH:
- Photoperiod:
- Light intensity:

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :

VEHICLE CONTROL PERFORMED: no

RANGE-FINDING STUDY
- Test concentrations: non GLP pre-test
- Results used to determine the conditions for the definitive study:

Reference substance (positive control):

yes

Remarks:

Potassium dichromate K2Cr2O7 (CAS No. 7778-50-9)

Results and discussion

Effect concentrations

Effect concentrations 1

Key result

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

> 2.54 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mobility

Effect concentrations 2

Key result

Duration:

48 h

Dose descriptor:

NOEC

Effect conc.:

> 2.54 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mobility

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

No immobilisation at 2.54 mg/L (geom. mean) after 48 hours is observed. Considering the water solubility of the test item, only a low acute toxicity to aquatic invertebrates is assumed.

Executive summary:

One valid experiment was performed.

The study was performed as a limit test at the concentration 100 mg/L (nominal). For the test concentration and the blank control, 20 Daphnia were exposed to the test item for 48 hours in a static test system. After 24 and 48 hours, the immobilised Daphnia were counted.

None of the animals was immobilised in the blank control and the treatment. Therefore, no statistical evaluation was performed.

Potassium dichromate K₂Cr₂O₇(CAS No. 7778-50-9) was used as positive controlin a current reference study to assure that the test conditions are reliable.

 

At the beginning and at the end of the test, the content of the test item in the test solutions was determined usingHPLC-UV-determination. Because of the poor solubility of the test item, the measured concentration lay between 3 % and 2 % of the nominal concentration during the test. Therefore, the determination of the results was based on the geometric mean of the measured concentrations.

The following results were determined for the test item1,1'-Azobis(cyclohexane-1-carbonitrile)(species:Daphnia magna).

 

48h-NOEC≥2.54 mg/L
48h-LOEC> 2.54mg/L
24h-EC₅₀> 2.54 mg/L
48h-EC₅₀> 2.54 mg/L