Sodium bis[3-[[1-(3-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-hydroxy-N-methylbenzenesulphonamidato(2-)]cobaltate(1-)

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:

2005

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: well performed OECD study with GLP

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2005

Report date:

2005

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Deviations:

not specified

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Sodium bis[3-[[1-(3-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-hydroxy-N-methylbenzenesulphonamidato(2-)]cobaltate(1-)

EC Number:

275-863-1

EC Name:

Sodium bis[3-[[1-(3-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-hydroxy-N-methylbenzenesulphonamidato(2-)]cobaltate(1-)

Cas Number:

71701-14-9

Molecular formula:

C34H28Cl2CoN10O8S2.Na

IUPAC Name:

Cobaltate(1-), bis[3-[2-[1-(3-chlorophenyl)-4,5-dihydro-3-methyl-5-(oxo-kO)-1H-pyrazol-4-yl]diazenyl-kN1]-4-(hydroxy-kO)-N-methylbenzenesulfonamidato(2-)]-, sodium (1:1)

Details on test material:

purity: 94.79 %

Sampling and analysis

Analytical monitoring:

no

Test solutions

Vehicle:

no

Details on test solutions:

Stock solution: The solution (100 mg/L test item was weighed out) was prepared with dilution water one day prior to application.
Dispersion treatment: The stock solution was shaken at room temperature with 20 rpm for 24 h (rotating shaker 3040, GFL) and membrane filtrated with 0.45 μm (RC, SCHLEICHER & SCHUELL).
Limit concentration: Saturated solution (100 mg/L)
CONTROL :Dilution water without test item tested under the same conditions as the test groups.

Test organisms

Test organisms (species):

Daphnia magna

Details on test organisms:

Test organism: Daphnia magna STRAUS (Clone 5)
Reason for the selection: Daphnia magna STRAUS belongs, in accordance with the study guideline, to the suitable Daphnia types and are bred in the test facility.
Origin. Institut für Wasser-, Boden- und Lufthygiene (WaBoLu)
Breeder: DR.U.NOACK-LABORATORIEN, 31157 Sarstedt, Germany
Culture: In 2-3 L glass vessels with approximatively 1.8 L culture medium, at 21 °C (temperatures of 20 - 25 °C are tolerated), in an
incubator, 16 h illumination, illumination strength max. 20 μE⋅m-2 ⋅ s-1.
Culture medium: Culture medium Elendt M4, according to Elendt (1990), modified to a total hardness of 160 to 180 mg CaCO3/L.
Feeding: At least 5x weekly ad libitum with a mix of Desmodesmus subspicatus and Chlorella vulgaris, with an algae cell density of > 106 cells/mL.

2 to 24 h old daphnids were used for the definitive study. They were obtained by removing the mother animals twice within 22 h.
The daphnids were acclimated to the dilution water ca. 2 hours before test start. The daphnids were not fed during the study

Study design

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

48 h

Post exposure observation period:

no

Test conditions

Test temperature:

19 - 21 °C

pH:

7.82 - 7.89

Dissolved oxygen:

8.18 - 8.56 mg/L

Nominal and measured concentrations:

saturated solution with nominal 100 mg/L

Details on test conditions:

Test vessels: Glass beakers (5 cm ID x 8 cm H), 50 mL volume will be used.
Volume of the study medium: 20 mL

Number of study organisms per concentrationand control: 20 animals, divided into 4 (2*) parallel samples, each with 5 (10*) animals
Number of animals per test vessel: 5 (10*)
Number of parallel samples per concentration: 4 (2*)
*) The information in brackets refers to the test of the reference item

Age of test organisms: 2 - 24 h old
Acclimation: Ca. 2 h
Test temperature: 18 - 22 °C, ± 1 °C constant
Illumination: Diffuse light, illumination range max. 20 μE⋅m-2 ⋅ s-1
Photoperiod: 16/8 h light/dark cycle
Feeding: The daphnids were not fed during the study.

Reference substance (positive control):

yes

Results and discussion

Effect concentrations

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

> 100 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Details on results:

At the saturated solution (100 mg/L) of the test item no biologically significant effect was determined.

Results with reference substance (positive control):

The percentage immobility for the reference item was determined after 24 h. The EC100-value
was determined directly from the test results. The EC10- and EC50- with 95 % confidence interval
(CI) was determined in a probability network by interpolation according to standard procedures.
EC-values after 24 h of the reference item in mg/L:
EC10 : 1.48
EC50 : 1.80 (CI 1.68 - 1.93)
EC100 : 3.20
The EC50-value of the reference item potassium dichromate after 24 h is within the prescribed
concentration range of 1.0 - 2.5 mg/L of quality criteria according to AQS: DIN Guideline
38412 L 30.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

At the saturated solution (100 mg/L) of the test item no biologically significant effect was determined.

Executive summary:

In the acute immobilisation test with Daphnia magna (STRAUS) the effect of the saturated solution# (100 mg/L) as limit concentration of the test item was determined according to OECD 202 (2004) and EC Directive 92/69/EC Method C.2 (1992). The limit test was conducted under static conditions over 48 h 20 test organisms were exposed to the limit concentration and control. No test item analysis was carried out. A reference test was carried out with potassium dichromate to determine the toxicity of the reference item. The EC50-value of the reference item of 1.80 mg/L after 24 h was within the prescribed concentration range of 1.0 to 2.5 mg/L according to AQS, DIN Guideline 38412 L 30. Water quality parameters pH-value and dissolved oxygen concentration, measured at 0 and 48 h, were determined to be within the acceptable limits. The validity criteria of the test guideline were fulfilled.

No Daphnia incapable of swimming was observed after 24h and 48h exposure time

#) Saturated solution: The maximum dissolved concentration of the test item that can be achieved under the test conditions in the test medium, acc. to OECD Series, No. 23 (2000)6.