Ethyltriphenylphosphonium acetate

Short-term toxicity to fish

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

short-term toxicity to fish

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

secondary literature

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH


1. HYPOTHESIS FOR THE ANALOGUE APPROACH

For the source substance Ethyltriphenylphosphonium bromide, the read-across approach is based on the identity of the relevant dissociation product with the target substance: The source substance Ethyltriphenylphosphonium bromide is a salt dissociating readily in the bromide anion and the Ethyltriphenylphosphonium cation. The cation is identical for the target substance whereas the anion bromide is expected to enhance ecotoxicity compared to the target substance cation acetate.

For the source substance Methyltriphenylphosphonium chloride, the read-across approach is based on the similarity of the relevant dissociation product with the target substance: The source substance Methyltriphenylphosphonium chloride is a salt dissociating readily in the chloride anion and the Methyltriphenylphosphonium cation. The cation is similar for the target substance whereas the anion chloride is expected to have no influence on ecotoxicity compared to the target substance cation acetate.


2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
no additional information needed for the conclusion made from this read-across approach

3. ANALOGUE APPROACH JUSTIFICATION
For the target substance information on ecotoxicity is not yet available - testing is ongoing.

4. DATA MATRIX
To be provided when test results are available.

Sublethal observations / clinical signs:

Published information from Echa on aquatic toxicity for Ethyltriphenylphosphonium salts

 

ETHYLTRIPHENYLPHOSPHONIUM BROMIDE

https://echa.europa.eu/de/registration-dossier/-/registered-dossier/5487/6/2/2

fish 96h-EC50 ≥ 39.5mg/l

Ethyltriphenylfosfonium bromide

A 96 h study was conducted for CAS No.1530-32-1 on Danio rerio, at a test concentrations of 18 mg/L, 23.4 mg/L, 30.42 mg/L, 39.54 mg/L & 51.4 mg/L. The fishes were moving slowly as compared to control. No mortalities were found in the control aquaria. 

 

daphnia 48h-EC50 = 24.6 mg/l

Prediction is done using QSAR Toolbox version 3.1

The effective concentration (EC50) value of ethyltriphenylfosfonium bromide in aquatic invertebrate (Daphnia magna) in a 48 hr study on the basis of intoxication effect was estimated to be 24.623 mg/L.

 

algae 72h-ErC50 = 31mg/L

After 72 hours of exposure to Ethyltriphenylfosfonium bromide (CAS No. 1530-32-1) to various nominal test concentration, EC50 calculated from equation and graphically through probit analysis was found to be 30.9134 mg/L and 31.62 mg/L respectively.

 

 

-Iodide

no fish test

 

 

Methyltriphenylphosphonium chloride

https://echa.europa.eu/de/registration-dossier/-/registered-dossier/4850/6/2/4

fish 96h-EC50 ≥ 100mg/l

 

algae 72h-ErC50 = 2.7mg/l

 

daphnia 48h-EC50 = 1.1mg/l

Conclusions:

Published information from Echa homepage on aquatic toxicity of Ethyltriphenylphosphonium bromide and Methyltriphenylphosphonium chloride show, that fish is the least sensitive species in short term ecotoxicity tests compared to algae and daphnia.

Reference 2

Endpoint:

short-term toxicity to fish

Type of information:

(Q)SAR

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification

Justification for type of information:

1. SOFTWARE
ECOSAR v 2.0

2. MODEL (incl. version number)
ECOlogical Structure Activity Relationship (ECOSAR) software v2.0 for Microsoft Windows; U.S. Environmental Protection Agency; (October, 2017)

3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
P(CC(=O)(O))(c2ccccc2)(c3ccccc3)(c1ccccc1)CC

4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
[Explain how the model fulfils the OECD principles for (Q)SAR model validation. Consider attaching the QMRF or providing a link]
- Defined endpoint:
Aquatic toxicity

- Unambiguous algorithm:
see attached justification

- Defined domain of applicability:
see attached justification

- Appropriate measures of goodness-of-fit and robustness and predictivity:
see attached justification

- Mechanistic interpretation:
see attached justification


5. APPLICABILITY DOMAIN
see attached justification

6. ADEQUACY OF THE RESULT
see attached justification

GLP compliance:

no

Specific details on test material used for the study:

SMILES:
P(CC(=O)(O))(c2ccccc2)(c3ccccc3)(c1ccccc1)CC

Sublethal observations / clinical signs:

--------------------------------------

Values used to Generate ECOSAR Profile

--------------------------------------

Log Kow: -1.139     (EPISuite Kowwin v1.68 Estimate)

Wat Sol: 1.437E+005 (mg/L, EPISuite WSKowwin v1.43 Estimate)

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ECOSAR v1.11 Class-specific Estimations

--------------------------------------

******************************************************************************

| Not Related to an Existing ECOSAR Class Definition                         |

|                                                                            |

| Estimates provided below use the Neutral Organics QSAR equations which     |

| represent baseline toxicity potential (minimum toxicity) assuming a simple |

| non-polar narcosis model.  Without empirical data on structurally similar  |

| chemicals, it is uncertain if this substance will present significantly    |

| higher toxicity above baseline estimates.                                  |

******************************************************************************

                                                                   Predicted

ECOSAR Class                 Organism            Duration  End Pt   mg/L (ppm)

===========================  ==================  ========  ======   ==========

--> Acid moeity found: Predicted values multiplied by 10

Neutral Organics-acid      : Fish                96-hr     LC50     1.9e+006 *

Neutral Organics-acid      : Daphnid             48-hr     LC50    8.07e+005 *

Neutral Organics-acid      : Green Algae         96-hr     EC50    1.81e+005 *

Neutral Organics-acid      : Fish                          ChV     1.32e+005

Neutral Organics-acid      : Daphnid                       ChV     35108.699

Neutral Organics-acid      : Green Algae                   ChV     24892.484

Neutral Organics-acid      : Fish (SW)           96-hr     LC50    2.34e+006 *

Neutral Organics-acid      : Mysid               96-hr     LC50    1.46e+007 *

Neutral Organics-acid      : Fish (SW)                     ChV     37434.910

Neutral Organics-acid      : Mysid (SW)                    ChV      3.2e+006 *

Neutral Organics-acid      : Earthworm           14-day    LC50    12890.786

Note:  * = asterisk designates: Chemical may not be soluble enough to

       measure this predicted effect. If the effect level exceeds the

       water solubility by 10X, typically no effects at saturation (NES)

       are reported.

Conclusions:

Predicted EC50 values for fish (1.9e6 mg/l), daphnia (8.7e5 mg/l) and green algae (1.81e5 mg/l) show that fish is the least sensitive species compared to daphnia and algae.

Reference 3

Endpoint:

short-term toxicity to fish

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Principles of method if other than guideline:

standard static acute fish toxicity test method; screening test without detailed information

GLP compliance:

no

Analytical monitoring:

no

Test organisms (species):

Pimephales promelas

Details on test organisms:

TEST ORGANISM
- Common name: fathead minnows
- Strain: Rafinesque

Test type:

static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

96 h

Test temperature:

12°C

Details on test conditions:

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: dechlorinated Lake Huron water

Key result

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

1 726 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: 95% c.i.

Remarks:

1621 - 1831 mg/L

Duration:

96 h

Dose descriptor:

LC10

Effect conc.:

1 575 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: 95% c.i.

Remarks:

1340 - 1663 mg/L

Duration:

96 h

Dose descriptor:

other: LC90

Effect conc.:

1 891 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: 95% c.i.

Remarks:

1794 - 2205 mg/L

Conclusions:

The 96 h LC50 of ETPPAAc to Pimephales promelas was 1726 mg/L.

Description of key information

• There is a supporting company report on a fish test with limited documentation stating a 96h-LC50 of 1726mg/L.
• According to a Ecosar QSAR calculation, fish is the least sensitive species compared to daphnia and algae.
• For the similar substance EthylTriphenylPhosphonium Bromide and MethylTriphenylPhosphonium Chloride, according to information published on Echa Homepage, fish is the least sensitive species compared to daphnia and algae.

With the information above, fish can is seen as less sensitive to EtPPAAc than daphnia and algae.

Following the threshold approach as described by (OECD 2012 FISH TOXICITY TESTING FRAMEWORK Series on testing and assessment No 171) and (guidance R7b, 2016, p47) a standard OECD 203 fish test can be avoided, if there is sufficient valid information that fish less sensitive than daphnia and algae.

In conclusion, there is sufficient information on sensitivity of fish compared to daphnia and algae to waive the performance of a standard fish test.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish

Effect concentration:

1 726 mg/L