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Short-term toxicity to fish

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Reference
Endpoint:
short-term toxicity to fish
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23.01.03 - 17.06.03
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 203 (Fish, Acute Toxicity Test)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method C.1 (Acute Toxicity for Fish)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Analytical monitoring:
yes
Details on sampling:
Test solutions were prepared daily.
Verification of the test item concentrations was carried out after 0 and 24 h for batch 1.
For batches 2, 3 and 4 test item concentrations were verified after 0 h only.
Vehicle:
no
Details on test solutions:
PREPARATION AND APPLICATION OF TEST SOLUTION (especially for difficult test substances)
- Method: Prepared daily. 10 g/L solution in desalted water, which then served as a stock solution.
- Evidence of undissolved material (e.g. precipitate, surface film, etc.): Test solutions at 90 and 150 mg/L were yellow coloured and brown flocculations were observed at the bottom of the test vessels. Test solutions at 260 – 800 mg/L were brown coloured and completely clear.
Test organisms (species):
Cyprinus carpio
Details on test organisms:
TEST ORGANISM

- Source: Di Mamma, Brakel, Netherlands
- Length at study initiation (length definition, mean, range and SD): 3 cm (mean)

HOLDING CONDITIONS

- Holding conditions: Fish held in 200 or 300 L tanks containing dechlorinated drinking water at 20°C + 2°C with continuous flow
- Type and amount of food during acclimation: Fed approximately 2% of body weight
- Feeding frequency during acclimation: Daily
- Health during acclimation (any mortality observed): Quarantined for 14 days prior to test without any treatment. Fish showed a normal behaviour pattern and were free from visible diseases.

FEEDING DURING TEST

- Feeding during test: None
Test type:
semi-static
Water media type:
freshwater
Limit test:
no
Total exposure duration:
96 h
Hardness:
14° dH
Test temperature:
20.2°C (mean)
19.8 - 20.7°C
pH:
3.0 - 7.7. Discrepancy of the pH from desired value (pH 8+ 1) is an effect of the product in water
Dissolved oxygen:
97 - 101 % saturation
Salinity:
Not applicable
Nominal and measured concentrations:
Nominal 90, 150, 260, 460 and 800 mg/L.
Measured (batch 1, 0 hour): 45, 129, 263, 448 and 756 mg/L (the value corresponding to nominal 90 mg/L was out of range and not regarded as valid)
Measured (batch 1, 24 hours); 90, 148, 266, 476 and 840 mg/L
Measured (batch 2, 0 hour, 90 mg/L nominal): 95 mg/L
Measured (batch 3, 0 hour, 90 mg/L nominal): 90 mg/L
Measured (batch 4, 0 hour, 90 mg/L nominal): 101 mg/L
As the measured concentrations at 24 hours did not deviate by more than 20% from nominal, nominal concentrations were used for the reporting of results.
Details on test conditions:
TEST SYSTEM

- Test vessel: 20 L tanks
- Aeration: Continuous
- Renewal rate of test solution (frequency/flow rate): Renewal every 24 hours
- No. of organisms per vessel: 10, each at ~0.4 g
- No. of vessels per concentration (replicates): 1
- No. of vessels per control (replicates): 1
- No. of vessels per vehicle control (replicates): Not relevant

TEST MEDIUM / WATER PARAMETERS

- Source/preparation of dilution water: Synthetic freshwater
- Ca/mg ratio: 4:1

OTHER TEST CONDITIONS

- Adjustment of pH: None. The test solutions at 460 and 800 mg/L were not used due to low pH, for animal welfare reasons
- Photoperiod: 16h light 8 h dark

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) : Mortality

TEST CONCENTRATIONS

- Spacing factor for test concentrations: 1.7
Reference substance (positive control):
not specified
Duration:
96 h
Dose descriptor:
LC50
Effect conc.:
116 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality (fish)
Remarks on result:
other:
Remarks:
Range: 90 - 150 mg/L
Details on results:
It was concluded that the test substance was present over the whole test duration and therefore the results were calculating using the nomnal concentrations.
Validity criteria fulfilled:
yes
Remarks:
control mortality did not exceed 10% at the end of the test; DO concentration was > 60 % of the air saturation value at the temperature used; the concentration of the test item was maintained throughout the test (> 80% of the nominal concentration).
Conclusions:
The 96h LC50 of Rhodium (III) nitrate hydrate is 116 mg/L.
Executive summary:

Enste-Diefenbach (2003) is a GLP compliant study and followed a standard guideline. However, pH values were outside the desired limit for this test and the two highest test concentrations were not used due to the very low pH. There was some evidence of undissolved test material in the 90 and 150 mg/L test solutions but the higher test concentrations were clear. No mortality was observed at 90 mg/L, and 100 % mortality was observed in the 150 and 260 mg/L test solutions. The LC50 value was therefore determined graphically. The 96h LC50 of Rhodium (III) nitrate hydrate is 116 mg/L.

 

This study followed a standard test guideline but there were restrictions in the study design therefore it is assigned a Klimisch score of 2 (reliable with restrictions).

Description of key information

The 96h LC50 of Rhodium (III) nitrate hydrate is 116 mg/L.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
116 mg/L

Additional information

Enste-Diefenbach (2003) is a GLP compliant study and followed a standard guideline. However, pH values were outside the desired limit for this test and the two highest test concentrations were not used due to the very low pH. There was some evidence of undissolved test material in the 90 and 150 mg/L test solutions but the higher test concentrations were clear. No mortality was observed at 90 mg/L, and 100 % mortality was observed in the 150 and 260 mg/L test solutions. The LC50 value was therefore determined graphically. The 96h LC50 of Rhodium (III) nitrate hydrate is 116 mg/L.

 

This study followed a standard test guideline but there were restrictions in the study design therefore it is assigned a Klimisch score of 2 (reliable with restrictions).