(2R)-6-fluoro-2-(oxiran-2-yl)chromane

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:

2017-04-17 to 2017-05-19

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method C.2 (Acute Toxicity for Daphnia)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

other: Guidance document on aquatic toxicity testing of difficult items and mixtures, OECD series on testing and assessment number 23, December 14, 2000.

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

(2R)-6-fluoro-2-(oxiran-2-yl)chromane

EC Number:

930-890-4

Cas Number:

1219915-04-4

Molecular formula:

C11H11FO2

IUPAC Name:

(2R)-6-fluoro-2-(oxiran-2-yl)chromane

Test material form:

liquid

Details on test material:

- Name of test material (as cited in study reports): JNJ-42398681-AAA (T001589)
- Physical state: liquid
- Appearence: light brown

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: I16FB3011
- Expiration date of the lot/batch: 2018-03-14 (retest date)
- Analytical purity: 86.6% (based on technical document DS-TEC-128833)

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature
- Stability under test conditions: not indicated
- Solubility and stability of the test substance in the solvent/vehicle: not available

Sampling and analysis

Analytical monitoring:

yes

Details on sampling:

- Sampling method: Samples for possible analysis were taken from all test concentrations and the control at t=0 and t=48h. 3.2 mL of volume was taken. At the end of the exposure period, the replicates were pooled at each concentration before sampling.
- Sample storage conditions before analysis: The samples were stored in a freezer. Additionally, reserve samples of 3.2 mL were taken for possible analysis.

Test solutions

Vehicle:

no

Details on test solutions:

PREPARATION AND APPLICATION OF TEST SOLUTION (especially for difficult test substances)
- Method: Due to an expected low water solubility of the test item in combination with the composition of the test item as indicated in the Technical Document, Water Accommodated Fractions were prepared individually. The preparation of test solutions started with loading rates of 1.0 to 114 mg/L (combined limit/range-finding test: 1.1 to 114 mg/L, final test: 1.0 to 100 mg/L) applying an overnight period of magnetic stirring at room temperature to ensure maximum dissolution of the test item in test medium. Subsequently, a settling period of approximately one hour followed to allow proper separation of the different liquid phases. This resulted in clear and colourless dispersions that contained undissolved floating material. Thereafter, the aqueous Water Accommodated Fractions (WAFs) were collected by means of siphoning and used as test concentrations. Siphoning was used as it is more efficient for separating liquid phases compared to filtration.
- Evidence of undissolved material (e.g. precipitate, surface film, etc): All final test solutions were clear and colourless.

Test organisms

Test organisms (species):

Daphnia magna

Details on test organisms:

TEST ORGANISM
- Common name: Water-flea
- Source: in-house laboratory culture with a known history
- Age at study initiation (mean and range, SD): < 24 h (from parental daphnids of more than 2 weeks old, maximum age 4 weeks)
- Method of breeding: 250 newborn daphnids (i.e. less than 3 days old) are placed into 5 liters of medium in an all-glass culture vessel. Medium is M7. After 7 days of cultivation half of the medium is renewed twice a week.
- Feeding during cultivation: fresh water algae, daily
- Feeding during test: no

ACCLIMATION
- Acclimation period: not relevant

Study design

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

48 h

Test conditions

Hardness:

180 mg/L as CaCO3

Test temperature:

20-21°C

pH:

At t=0h: 7.7-8.0
At t=48h: 8.1 - 8.2

Dissolved oxygen:

At t=0h: 8.6-9.1
At t=48h: 9.0-9.2

Salinity:

not relevant

Nominal and measured concentrations:

Range finder:
Nominal concentrations: 1.1, 11, 114 mg/L
Measured concentrations (mg/L) at t=0h: 10.5, 106
Measured concentrations (mg/L) at t=48h: 9.76, 98.5

Final test:
Nominal concentrations: WAFs prepared at 4.6, 10, 22, 46 and 100 mg/L
Measured concentrations (mg/L) at t=0h: n.d., 4.02, 8.81, 18.4, 39.0, 87.1
Measured concentrations (mg/L) at t=48h: n.d., 3.74, 8.15, 17.4, 36.7, 81.1

n.d. = not detected

Details on test conditions:

TEST SYSTEM
- Test vessel: beaker
- Material, size, headspace, fill volume: 100 mL, glass beaker filled with 80 mL
- Aeration: not during the test
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4
- Test medium: adjusted ISO medium

OTHER TEST CONDITIONS
- Adjustment of pH: Prior to the preparation of the test solutions, the pH of the test medium was adjusted using 1M HCl (Merck, Darmstadt Germany). For the combined limit/range finding test the pH was adjusted from 8.2 to 7.9 and in the final test from 8.3 to 7.7, respectively.
- Photoperiod: 16h light daily

EFFECT PARAMETERS MEASURED (with observation intervals if applicable): Immobility was defined as those organisms which are not able to swim within 15 seconds after gentle agitation of the test container and was monitored after 24 and 48 hours of continuous treatment with the test substance.

TEST CONCENTRATIONS
- Spacing factor for test concentrations: 2.2
- Range finding study
- Test concentrations: 1.14, 11, 114 mg/L (setup: combined range finder/limit test)
- Results used to determine the conditions for the definitive study: yes

Reference substance (positive control):

yes

Remarks:

Potassium dichromate

Results and discussion

Effect concentrations

Key result

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

14 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mobility

Remarks on result:

other: 95% C.L.: 13-15 mg/L

Details on results:

- Mortality of control: none
- Other adverse effects control: no
- Abnormal responses: none

Results with reference substance (positive control):

- Results with reference substance valid? yes
- Mortality: no
- EC50/LC50: 48-h EC50 = 0.48 mg/L. The sensitivity of the daphnids was within the range determined with the historical data collected at Charles River Laboratorie Den Bosch.

Reported statistics and error estimates:

The 24h-EC50-value was calculated from the probits of the percentages of affected daphnids and the logarithms of the corresponding test item concentrations (analytically confirmed nominal concentration) using the maximum likelihood estimation method.
The 48h-EC50-value was calculated using the Trimmed Spearman-Kaerber interpolation.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The acute toxicity of T001589 to Daphnia magna was determined in a 48 hour static test according to OECD guideline 202. Based on average exposure concentrations, the 48-h EC50 was determined to be 14 mg/L (95% confidence interval between 13 and 15 mg/L). The results of the test can be considered reliable without restriction.