Dihydrogen (ethyl)[4-[4-[ethyl(3-sulphonatobenzyl)amino](4-hydroxy-2-sulphonatobenzhydrylidene]cyclohexa-2,5-dien-1-ylidene](3-sulphonatobenzyl)ammonium, disodium salt

Toxicity to aquatic algae and cyanobacteria

Link to relevant study record(s)

Reference

Endpoint:

toxicity to aquatic algae and cyanobacteria

Type of information:

experimental study

Adequacy of study:

key study

Study period:

09.10.2017-12.10-2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Experimental test result performed using standard test guideline

Justification for type of information:

Experimental test result performed using standard test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 201 (Alga, Growth Inhibition Test)

Principles of method if other than guideline:

Aim of this study was to evaluate the nature of chemical when comes in contact with the test organism. Test was conducted according to the OECD guideline 201.

GLP compliance:

not specified

Analytical monitoring:

not specified

Vehicle:

not specified

Details on test solutions:

The stock solution 160 mg/Lwas prepared by dissolving dark green powder in OECD growth medium .Test solutions of required concentrationas were prepared by mixing the stock solution of the test sample with OECD growth medium and inoculum culture.

Test organisms (species):

Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)

Details on test organisms:

TEST ORGANISM- Common name: - Strain: 86.81 SAG- Source (laboratory, culture collection): Institute of botany of the ASCR- Initial biomass concentration: 5x10(3) cells /ml - Method of cultivation: No data availableACCLIMATION - No data available- Acclimation period:- Culturing media and conditions (same as test or not):- Any deformed or abnormal cells observed:

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

72 h

Test temperature:

23±2°C

pH:

Test at highest concentration: Control:

Nominal and measured concentrations:

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

Details on test conditions:

TEST SYSTEM- Test vessel: 50 ml glass vessel- Type (delete if not applicable): closed (with air permeable stopper)- Sample volume: -------- ml- Initial cells density: 5x10(3) cells/ml- No. of vessels per concentration (replicates): --------GROWTH MEDIUM- Standard medium used: yesOTHER TEST CONDITIONS- Adjustment of pH: No- Photoperiod: Continuous- Light intensity and quality: 6000-8000 lxEFFECT PARAMETERS MEASURED (with observation intervals if applicable) :- Determination of cell concentrations: microscope with counting chamber Cyrus I or electronic particle counter.- Other: ErC50 was calculated using non-linear regression by the software Prism 4.0

Reference substance (positive control):

yes

Remarks:

Potassium dichromate (K2Cr2O7)

Key result

Duration:

72 h

Dose descriptor:

EC50

Effect conc.:

62.9 mg/L

Nominal / measured:

meas. (not specified)

Conc. based on:

test mat.

Basis for effect:

growth rate

Remarks on result:

other: 95 % CI

Results with reference substance (positive control):

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

Reported statistics and error estimates:

EC50 was calculated using non linear regression by the software Prism 4.0 OR (The differences in means of control and sample were estimated by the t-test for independent groups at a 95 % confidence level, all individual replicates were used (STATISTICA CZ – data analysis software system, version 9.0, StatSoft, Inc.). Statistically significant differences are for p < 0.05.)

Validity criteria fulfilled:

yes

Conclusions:

Based on the growth rate inhibition of algae Desmodesmus subspicatus (previous name: Scenedesmus subspicatus) due to the exposure of chemical Fast Green FCF the EC50 was determine to be 62.9 mg/L.

Executive summary:

Aim of this study was to evaluate the nature of chemical test chemical when comes in contact with the test organism Desmodesmus subspicatus (previous name: Scenedesmus subspicatus). Test was conducted according to the OECD guideline 201. The test solution 160 mg/l was prepared by dissolving green powder in OECD growth medium. Effects on the growth rate of the organism were studied (Changable). Various concentration were used.

With the test substance one positive control Potassium dichromate (K2Cr2O7) was also run simultaneously. After the exposure of chemical, effect concentration EC50 was calculated using nonlinear regression by the software Prism 4.0. Effect on the growth of algae was determine after an exposure period of 72 hrs.

The median effective concentration (EC50) for the test substance Fast Green FCF, in algae was determined to be 62.9 mg/L on the basis of growth rate inhibition effects in a 72 hour study. Based on the EC50 value, indicates that the substance is likely to be hazardous/ non-hazardous to aquatic algae and can be be classified as aquatic hronic 3 category as per the CLP criteria.

Description of key information

Aim of this study was to evaluate the nature of chemical test chemical when comes in contact with the test organism Desmodesmus subspicatus (previous name: Scenedesmus subspicatus). Test was conducted according to the OECD guideline 201.The test solution 160 mg/l was prepared by dissolving green powder in OECD growth medium. Effects on the growth rate of the organism were studied (Changable). Various concentration were used.

With the test substance one positive control Potassium dichromate (K2Cr2O7) was also run simultaneously. After the exposure of chemical, effect concentration EC50 was calculated using nonlinear regression by the software Prism 4.0. Effect on the growth of algae was determine after an exposure period of 72 hrs.

The median effective concentration (EC50) for the test substance Fast Green FCF, in algae was determined to be 62.9 mg/L on the basis of growth rate inhibition effects in a 72 hour study. Based on the EC50 value, indicates that the substance is likely to be hazardous/ non-hazardous to aquatic algae and can be be classified as aquatic hronic 3 category as per the CLP criteria.

Key value for chemical safety assessment

EC50 for freshwater algae:

62.9 mg/L

Additional information

Aim of this study was to evaluate the nature of chemical test chemical when comes in contact with the test organism Desmodesmus subspicatus (previous name: Scenedesmus subspicatus). Test was conducted according to the OECD guideline 201.The test solution 160 mg/l was prepared by dissolving green powder in OECD growth medium. Effects on the growth rate of the organism were studied (Changable). Various concentration were used.

With the test substance one positive control Potassium dichromate (K2Cr2O7) was also run simultaneously. After the exposure of chemical, effect concentration EC50 was calculated using nonlinear regression by the software Prism 4.0. Effect on the growth of algae was determine after an exposure period of 72 hrs.

The median effective concentration (EC50) for the test substanceFast Green FCF, in algae was determined to be 62.9 mg/L on the basis of growth rate inhibition effects in a 72 hour study. Based on the EC50 value, indicates that the substance is likely to be hazardous/ non-hazardous to aquatic algae and can be be classified as aquatic hronic 3 category as per the CLP criteria.