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Short-term toxicity to aquatic invertebrates

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Reference
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
Justification for type of information:
Data is from ABITEC study report.
Qualifier:
according to
Guideline:
OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
Principles of method if other than guideline:
Aquatic invertebrate immobilisation test was carried out on Daphnia magna with the substance 3-Nitroacetophenone according to OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)
GLP compliance:
no
Specific details on test material used for the study:
- Name of test material (as cited in study report): 3'-nitroacetophenone
- Molecular formula: C8 H7 N O3
- Molecular weight: 165.147g/mol
- Smiles notation: c1(cc(ccc1)[N+](=O)[O-])C(C)=O
- InChl : 1S/C8H7NO3/c1-6(10)7-3-2-4-8(5-7)9(11)12/h2-5H,1H3
- Substance type: Organic
- Physical state: solid
Analytical monitoring:
not specified
Vehicle:
yes
Details on test solutions:
The stock solution (100 mg/L) was prepared by dissolving light brown powder in reconstituted water. The solution was kept in ultrasonic bath for 20 minutes. Test solutions of required concentrationas were prepared by mixing the stock solution of the test sample with reconstituted test water.
Test organisms (species):
Daphnia magna
Details on test organisms:
TEST ORGANISM
- Common name: Water flea
- Strain: Straus
- Source: Own breeding at University of Chemistry and Technology, Prague
- Age at study initiation (mean and range, SD): The animals used for the test shall be less than 24 h old and should not be first brood progeny
- Feeding during test: No feeding
Test type:
static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Remarks on exposure duration:
± 1 hr
Test temperature:
20±1°C
pH:
without adjustment,
sample at concentration 64.0 mq/l: pH= 7.8 did not changed during the test,
control: pH= 7.8 changed to pH = 7.7 during the test
Dissolved oxygen:
higher than 7.9 mg/L at the end of test
Nominal and measured concentrations:
0, 4, 8, 16, 32 and 64 mg/L
Details on test conditions:
TEST SYSTEM
- Test vessel: 50 ml glass vessel
- fill volume: 25 ml
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water:
Natural water (surface or ground water), reconstituted water or dechlorinated tap water are acceptable as culturing and dilution water if D. magna survives in it for the duration of the culturing, acclimation and testing without showing signs of stress. Waters in the range pH 6 to pH 9, with hardness between 140 mg/l and 275 mg/l (as CaCO3) are recommended.
As an example, the preparation of dilution water meeting the requirements is described below.
Dissolve known quantities of reagents in water. The dilution water prepared shall have a pH of 7.8 ± 0.5, a hardness of (225 ± 50) mg/l (expressed as CaCO3), a molar Ca + Mg ratio close to 4 + 1 and a dissolved oxygen concentration above 7 mg/l.

Prepare the solutions specified below:
- Calcium chloride solution: Dissolve 117.6 g of calcium chloride dihydrate (CaCl2.2H2O) in water (4.2) and make up to 1 l with water (4.2).
- Magnesium sulfate solution: Dissolve 49.3 g of magnesium sulfate heptahydrate (MgSO4.7H2O) in water (4.2) and make up to 1 l with water (4.2).
- Sodium bicarbonate solution: Dissolve 25.9 g of sodium bicarbonate (NaHCO3) in water (4.2) and make up to 1 l with water (4.2).
- Potassium chloride solution: Dissolve 2.3 g of potassium chloride (KCI) in water (4.2) and make up to 1 l with water (4.2).

Mixing
Mix 2.5 ml of each of the four solutions and make up to 1 l with water.
The dilution water shall be aerated until the dissolved oxygen concentration has reached saturation and the pH has stabilized. If necessary, adjust the pH to 7.8 ± 0.5 by adding sodium hydroxide (NaOH) solution or hydrochloric acid (HCI). The dilution water prepared in this way shall not be further aerated before use.

- Sodium hydroxide solution, e.g. [NaOH] : 1 mol/l.
- Hydrochloric acid, e.g. [HCl] : 1 mol/l.

Reference substance:
Dissolve 600 mg of potassium dichromate (K2Cr2O7) in water and make up to 1 l with water (4.2).

OTHER TEST CONDITIONS
- Adjustment of pH: no adjustment done
- Photoperiod: No - Darkness
- Light intensity:

CALCULATION:
EC50 was calculated using non linear regression by the software Prism 4.0
Reference substance (positive control):
yes
Remarks:
Potassium dichromate (K2Cr2O7)
Key result
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
35.6 mg/L
Nominal / measured:
meas. (not specified)
Conc. based on:
test mat.
Basis for effect:
mobility
Remarks on result:
other: 95% CL: 28.7-44.1
Results with reference substance (positive control):
- Results with reference substance valid
- EC50: 0.79 mg/L (24 hours)
Reported statistics and error estimates:
EC50 was calculated using nonlinear regression by the software Prism 4.0 (GraphPad Software,Inc ,San Diego CA)
Validity criteria fulfilled:
yes
Conclusions:
The median effective concentration (EC50) for the test substance, 3'-nitroacetophenone in Daphnia magna was determined to be 35.6 mg/L on the basis of mobiity inhibition effects in a 48 hour study.
Executive summary:

Short term toxicity to aquatic invertebrates was performed in Daphnia magna for 48 hrs according to OECD Guideline 202. The stock solution (100.0 mg/L) was prepared  by dissolving  light brown powder in reconstituted  water. The test substance was tested at the concentrations 0, 4, 8, 16, 32 and 64 mg/L.

25 ml per replicate in 50 ml glass vessel were used. 5 daphnids were used in each testing vessels. The experiment was performed in darkness without feeding of daphnia. Effects on immobilization were observed for 48 hours.

The median effective concentration (EC50) for the test substance, 3'-nitroacetophenone in Daphnia magna was determined to be 35.6 mg/L for immobilization effects.

This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic chronic 3 as per the CLP criteria.

Description of key information

Short term toxicity to aquatic invertebrates was performed in Daphnia magna for 48 hrs according to OECD Guideline 202. The stock solution (100.0 mg/L) was prepared  by dissolving  light brown powder in reconstituted  water. The test substance was tested at the concentrations 0, 4, 8, 16, 32 and 64 mg/L.

25 ml per replicate in 50 ml glass vessel were used. 5 daphnids were used in each testing vessels. The experiment was performed in darkness without feeding of daphnia. Effects on immobilization were observed for 48 hours.

The median effective concentration (EC50) for the test substance, 3'-nitroacetophenone in Daphnia magna was determined to be 35.6 mg/L for immobilization effects.

This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic chronic 3 as per the CLP criteria.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
35.6 mg/L

Additional information

The study from Abitec laboratory (Determination of the inhibition of the mobility of daphnids, 2016) which has K1 reliability were used as key for short term toxicity to aquatic invertebrates.

The test was performed in Daphnia magna for 48 hrs according to OECD Guideline 202. The stock solution (100.0 mg/L) was prepared  by dissolving  light brown powder in reconstituted  water. The test substance was tested at the concentrations 0, 4, 8, 16, 32 and 64 mg/L.

25 ml per replicate in 50 ml glass vessel were used. 5 daphnids were used in each testing vessels. The experiment was performed in darkness without feeding of daphnia. Effects on immobilization were observed for 48 hours.

The median effective concentration (EC50) for the test substance, 3'-nitroacetophenone in Daphnia magna was determined to be 35.6 mg/L for immobilization effects.

This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic chronic 3 as per the CLP criteria.