[4-[[4-anilino-1-naphthyl][4-(dimethylamino)phenyl]methylene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium acetate

Short-term toxicity to aquatic invertebrates

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

23.08.2017- 25.08.2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Experiment test result performed using standard test guideline

Justification for type of information:

Data is from ABITEC lab report.

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Principles of method if other than guideline:

Short term toxicity of N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate to aquatic invertebrates was performed according to the OECD 202 guideline in a static system.

GLP compliance:

no

Specific details on test material used for the study:

- Name of test material: N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate- Molecular formula: C24 H28 N3.C2 H3 O2- Molecular weight: 417.5499 g/mol- Smiles notation: CC(=O)[O-].CNc1ccc(cc1)C(=C2C=CC(=[N+](C)C)C=C2)c3ccc(cc3)N(C)C- InChl : 1S/C24H27N3.C2H4O2/c1-25-21-12-6-18(7-13-21)24(19-8-14-22(15-9-19)26(2)3)20-10-16-23(17-11-20)27(4)5;1-2(3)4/h6-17H,1-5H3;1H3,(H,3,4)- Substance type: Organic- Physical state: liquid

Analytical monitoring:

not specified

Details on sampling:

No data available

Vehicle:

yes

Details on test solutions:

The stock solution 20 mg/L was prepared by dissolving dark violet iquid in reconstituted water. 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 feedingACCLIMATION - No data available- Acclimation period:- Acclimation conditions (same as test or not):- Type and amount of food:- Feeding frequency:- Health during acclimation (any mortality observed):

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:

Test at 0.100 mg/l: 8.1 (changed to 7.9 during test)Control: 7.7 (Changed to 7.9 during test)

Dissolved oxygen:

higher than 8.7 mg/L at the end of test

Nominal and measured concentrations:

0, 0.006, 0.012, 0.025, 0.050, 0.100 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): 4TEST 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).MixingMix 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.:

0.037 mg/L

Nominal / measured:

meas. (not specified)

Conc. based on:

test mat.

Basis for effect:

mobility

Remarks on result:

other: 95% CL: 0.025-0.054 mg/l

Results with reference substance (positive control):

- Results with reference substance valid- EC50: 0.76 mg/L (24 hours)

Reported statistics and error estimates:

EC50 was calculated using non linear regression by the software Prism 4.0

Validity criteria fulfilled:

not specified

Conclusions:

The median effective concentration (EC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate, in Daphnia magna was determined to be 0.037 mg/L on the basis of mobiity inhibition effects in a 48 hour study.

Executive summary:

Determination of the inhibition of the mobility of daphnids was carried out with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 202.

The test substance was tested at the concentrations 0, 0.006, 0.012, 0.025, 0.050, 0.100 mg/l. Effects on immobilisation were observed for 48 hours.

The median effective concentration (EC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N- methylmethanaminium acetate, in Daphnia magna was determined to be 0.037 mg/L for immobilisation effects.

This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.

Description of key information

Determination of the inhibition of the mobility of daphnids was carried out with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 202. The test substance was tested at the concentrations 0, 0.006, 0.012, 0.025, 0.050, 0.100 mg/l. Effects on immobilisation were observed for 48 hours. The median effective concentration (EC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl ]methylene} cyclohexa-2,5-dien-1-ylidene)-N- methylmethanaminium acetate, in Daphnia magna was determined to be 0.037 mg/L for immobilisation effects. This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

0.037 mg/L

Additional information

Short term toxicity to aquatic invertebrates for N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate (83803-79-6) was summaries with experimental data for target and experimental study of structural and functional similar read across substance are summaries as follows: 

In the first key study for the N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate (83803-79-6) from ABITEC lab 2017, determination of the inhibition of the mobility of daphnids was carried out with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 202. The test substance was tested at the concentrations 0, 0.006, 0.012, 0.025, 0.050, 0.100 mg/l. Effects on immobilisation were observed for 48 hours. The median effective concentration (EC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl ]methylene} cyclohexa-2,5-dien-1-ylidene)-N- methylmethanaminium acetate, in Daphnia magna was determined to be 0.037 mg/L for immobilisation effects. This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.

 

Similarly in the second supporting study for the read across chemical (569-64-2) which was structurally and functionally similar to the target chemical study was carried out from j-check 2017. Short term toxicity to aquatic invertebrate was performed in daphnia magna for 48 hrs. After the experiment, the EC 50 value for N-(4-{[4-(dimethylamino)phenyl](phenyl) methylene}cyclohexa -2,5-dien-1-ylidene)-N-methylmethanaminium chloride was determined to be 0.13 mg/l. Thus, based on the EC50 value, it can be concluded that the substance N-(4 -{[4 -(dimethylamino)phenyl](phenyl)methylene}cyclohexa-2,5 -dien-1 -ylidene)-N-methylmethanaminium chloride can be considered as toxic to aquatic organisms and can be consider to be classified as aquatic acute 1 category as per the CLP classification criteria.

 

Thus based on the both studies for the toxicity to aquatic invertebrates daphnia, it can be concluded that the N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate (83803-79-6) was toxic to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.