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Ecotoxicological information

Short-term toxicity to fish

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Reference
Endpoint:
short-term toxicity to fish
Type of information:
calculation (if not (Q)SAR)
Remarks:
estimated by calculation
Adequacy of study:
key study
Study period:
26 May 2015 to 26 May 2015
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Calculation method is used; calculation method applicable for the endpoint.
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 203 (Fish, Acute Toxicity Test)
Deviations:
yes
Remarks:
Calculation method
Qualifier:
equivalent or similar to
Guideline:
EU Method C.1 (Acute Toxicity for Fish)
Deviations:
yes
Remarks:
Calculation method
Principles of method if other than guideline:
The acute toxicity to fish was determined using a calculation method for the Mode of Action in question. This algorithm is based on a QSAR model which has been validated to be compliant with the OECD recommendations for QSAR modeling (OECD, 2004). The QSAR model is based on validated data derived from 96-hour test on fish. Further to this the lethal loading rate of the WAF is determined by using a series of calculation steps using phase equilibrium thermodynamics and excluding the non-bioavailable fraction, this approach is based on validated data derived from 96-hour LL50 tests on fish, for which the concentrations of the test item had been determined by chemical analyses over the test period.
GLP compliance:
no
Specific details on test material used for the study:
Not applicable
Analytical monitoring:
no
Details on sampling:
Not applicable
Vehicle:
no
Details on test solutions:
Not applicable
Test organisms (species):
Danio rerio (previous name: Brachydanio rerio)
Details on test organisms:
Not applicable
Test type:
other: calculation method
Water media type:
not specified
Total exposure duration:
96 h
Remarks on exposure duration:
LL50 (lethal loading rate of WAF)
Post exposure observation period:
Not applicable
Hardness:
Hardness is not a necessary component of the WAF calculation
Test temperature:
The Temperature is not a necessary component of the WAF calculation but extremely low or high temperatures could influence the solubility of certain constituents. Therefore, the calculation method is considered acceptable to determine LL50s for fish between 12 and 28 °C.
pH:
The pH is not a necessary component of the WAF calculation
Dissolved oxygen:
The oxygen concentration is not a necessary component of the WAF calculation
Salinity:
Salinity is not a necessary component of the WAF calculation. However as the fish QSAR for the constituents calculation was based on data from freshwater studies, the resulting calculation is considered valid for freshwater fish
Nominal and measured concentrations:
The calculation determines measured concentrations
Details on test conditions:
Calculation method
Reference substance (positive control):
not required
Remarks:
Calculation method
Key result
Duration:
96 h
Dose descriptor:
LL50
Effect conc.:
4.1 mg/L
Conc. based on:
test mat.
Basis for effect:
mortality
Details on results:
Not applicable
Results with reference substance (positive control):
Not applicable
Reported statistics and error estimates:
Not applicable

Table 6.1.1/1: Expected concentrations at this 96 h-LL50

Constituents

concentration in the WAF (mg/L)

dl-limonene

1.9

β-phellandrene

1.3

carene (Δ3)

0.21

β-pinene

0.27

p-cymene

0.17

α-terpinene

0.10

myrcene

0.080

Validity criteria fulfilled:
yes
Conclusions:
96 h-LL50 to fish for Reaction mass of β-phellandrene and d-limonene and l-limonene is 4.1 mg/L.
Therefore, the test item would not be classified as acute 1 to aquatic organisms in accordance with the CLP regulation.
Executive summary:

A calculation method prediction was performed to assess the acute toxicity of the test itemReaction mass of dl-limonene, β-phellandrene (Dipentene (2010)), to fish using the WAF method. This calculation method predicts the endpoint value which would be expected when testing the substance under experimental conditions in a laboratory following OECD Guideline 203 and EU method C.1 adapted for testing as a mixture using the WAF method. The criterion predicted was the lethal loading rate of the mixture LL50 (Median Lethal Loading), a statistically derived loading rate which is expected to cause mortality in 50 % of test animals within a period of 96 h.

The acute toxicity to fish was determined using a calculation method for the Mode of Action in question. This algorithm is based on a QSAR model which has been validated to be compliant with the OECD recommendations for QSAR modeling (OECD, 2004).The QSAR model is based on validated data derived from 96-hour test on fish.Further to this the lethal loading rate of the WAF is determined by using a series of calculation steps using phase equilibrium thermodynamics and excluding the non-bioavailable fraction, this approach is based on validated data derived from 96 h LL50 tests on fish, for which the concentrations of the test item had been determined by chemical analyses over the test period.

The iSafeRat® mixture module first uses Phase Equilibrium Thermodynamics to determine the analytically measurable concentrations in aqueous solutions expected from known WAF loading rates of characterised mixtures for fish, daphnids or algae. These loading rates are then divided into two parts: the bioavailable and non-bioavailable fractions per constituent. Existing experimental ecotoxicity endpoint values or predictions of these (from the single constituent ecotoxicity modules) are then used to determine the mixture ecotoxicity based on the sum of the chemical activities of the remaining bioavailable fractions of the individual constituents. The resulting value is converted back to the equivalent loading rate providing a LL50 value.

 

The LC50s of each constituent are already known from literature or predicted using the iSafeRat QSAR model. An additivity approach (based on Chemical Activity of each constituent) is used in order to calculate the Lethal Loading of the WAF.

Using this approach, the 96-h LL50 forDipentene (2010)to fish is 4.1 mg/L.

Based on the results of this study,Dipentene (2010)would not be classified as acute 1 to aquatic organisms in accordance with the classification of the CLP.

This toxicity study is acceptable and can be used for that endpoint.

Results Synopsis

Test Type: Calculation method

LL50: 4.1 mg/L

Description of key information

Using a calculation method, the 96-h LL50 to fish for Reaction of beta-phellandrene and d-limonene and l-limonene is 4.1 mg/L.

Key value for chemical safety assessment

LC50 for freshwater fish:
4.1 mg/L

Additional information

A calculation method prediction was available and has been performed to assess the acute toxicity of test item Reaction mass of beta-phellandrene and d-limonene and l-limonene to fish using the WAF method. This calculation method predicts the endpoint value which would be expected when testing the substance under experimental conditions in a laboratory following OECD Guideline 203 and EU method C.1 adapted for testing as a mixture using the WAF method. The criterion predicted was the lethal loading rate of the mixture LL50 (Median Lethal Loading), a statistically derived loading rate which is expected to cause mortality in 50% of test animals within a period of 96 h.

The LC50 of each constituent are already known from literature or predicted using the iSafeRat QSAR model. An additivity approach (based on Chemical Activity of each constituent) is used in order to calculate the Lethal Loading of the WAF. Using this approach, the 96-h LL50 to fish for Reaction mass of β-phellandrene and d-limonene and l-limonene is 4.1 mg/L.

Based on the results of this study, the registered substance would not be classified as acute 1 to aquatic organisms in accordance with CLP regulation.

This toxicity study is acceptable and can be used for that endpoint.