(6S,8S,9S,10R,11S,13S,14S,17R)-17-acetyl-11,17-dihydroxy-6,10,13-trimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one

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

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:

2017

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

(6S,8S,9S,10R,11S,13S,14S,17R)-17-acetyl-11,17-dihydroxy-6,10,13-trimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one

EC Number:

615-123-0

Cas Number:

7055-53-0

Molecular formula:

C22H32O4

IUPAC Name:

(6S,8S,9S,10R,11S,13S,14S,17R)-17-acetyl-11,17-dihydroxy-6,10,13-trimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one

Sampling and analysis

Analytical monitoring:

yes

Remarks:

LC-TOF/MS

Test organisms

Test organisms (species):

Daphnia magna

Details on test organisms:

Daphnia magna were aged of < 24 hours old.
They were taken from healthy laboratory cultures, which were hatched from dormant ephippia supplied by MicroBio Tests Inc.

Study design

Test type:

static

Water media type:

other: Elendt M4 medium

Limit test:

yes

Total exposure duration:

48 h

Post exposure observation period:

After 24 and 48 hours, the Daphnia magna in each test vessel were observed for evidence of immobility. The observations differentiated between mobile and immobile daphnids. An individual was considered immobile if, when the contents of the test vessel were briefly agitated, it did not swim during a 15-second period of observation. In addition, Daphnia magna submerged in the body of the test media and those that were held at the surface of the test media were also recorded.

Test conditions

Hardness:

Not specified

Test temperature:

19.4-20.7°C

pH:

7.46-7.55

Dissolved oxygen:

6.43-9.06 mg/L

Nominal and measured concentrations:

Nominal: 10 mg/L
Measured: 9.10 mg/L (9.54 mg/L at 0 h and 8.66 mg/L at 48 h)

Details on test conditions:

Fluorescent lighting
Photoperiod: 16h light/8h dark

Reference substance (positive control):

yes

Remarks:

potassium dichromate

Results and discussion

Effect concentrations

Effect concentrations 1

Key result

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

> 10 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mobility

Effect concentrations 2

Key result

Duration:

48 h

Dose descriptor:

LOEC

Effect conc.:

> 10 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mobility

Effect concentrations 3

Key result

Duration:

48 h

Dose descriptor:

NOEC

Effect conc.:

ca. 10 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mobility

Details on results:

Given that the mean measured concentration was within 80% of the nominal concentration, it was considered justifiable to base the results on nominal concentrations as recommended in the OECD 202 guideline.
Based on nominal concentrations, the 48-h EC50 value was determined to be > 10 mg/L. The corresponding NOEC was considered to be 10 mg/L.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The validity criteria for control immobility (=< 10%) and dissolved oxygen (>= 3 mg/L) were both satisfied. The test is therefore considered valid.
Based on nominal concentrations, the 48-h EC50 value was determined to be > 10 mg/L. The corresponding NOEC and LOEC were considered to be 10 mg/L and > 10 mg/L respectively.