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Toxicity to aquatic algae and cyanobacteria

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Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
for RA
Justification for type of information:
Data for the target chemical is summarized based on the structurally similar read across chemicals
Reason / purpose:
read-across source
Reason / purpose:
read-across source
Qualifier:
according to
Guideline:
other: as mentioned below
Principles of method if other than guideline:
WoE report is based on two toxicity study of aquatic algae and cyanobacteria for the test chemical :1. and 2. This study was designed to assess the effect of the test item on the growth of green alga Chlorella vulgaris. The study was conducted in accordance with “OECD guideline for testing of chemicals No. 201 – Alga, growth inhibition test”. 2.
GLP compliance:
not specified
Specific details on test material used for the study:
Name of the test chemical: Sodium 4-{[4-(diethylamino)phenyl][4-(diethyliminio)-2,5-cyclohexadien-1-ylidene]methyl}-6-hydroxy-1,3-benzenedisulfonateCommon Name: Patent Blue V Sodium saltMolecular Formula: C27H32N2O7S2.NaMolecular Weight: 582.6709 g/molSMILES Notation: CCN(CC)C1=CC=C(C=C1)C(=C2C=CC(=[N+](CC)CC)C=C2)C3=CC(=C(C=C3S(=O)(=O)[O-])S(=O)(=O)[O-])O.[Na+]InChI: 1S/C27H32N2O7S2.Na/c1-5-28(6-2)21-13-9-19(10-14-21)27(20-11-15-22(16-12-20)29(7-3)8-4)23-17-24(30)26(38(34,35)36)18-25(23)37(31,32)33;/h9-18H,5-8H2,1-4H3,(H2-,30,31,32,33,34,35,36);/q;+1/p-1
Vehicle:
not specified
Details on test solutions:
1.The effect of the test item on the green algae Chlorella vulgaris culture was observed at nominal test concentration of 6.25mg/l, 12.5mg/l, 25mg/l, 50mg/l, 100 mg/l and 200 mg/l. All the six concentrations were in geometric series spaced by a factor of 2
Test organisms (species):
Chlorella vulgaris
Details on test organisms:
1.The fresh water green alga Chlorella vulgaris, was used as the test system (organism). Sterile, unicellular, suspension cultures of algae were obtained from National Environmental Engineering Research Institute (NEERI), Nagpur and maintained at Unique Ecotox Research Laboratory, Nagpur. The culture was examined under the microscope to confirm that it was unicellular, healthy and not contaminated. 2.TEST ORGANISM- Common name:green alga - Strain:Chlorella vulgaris- Source (laboratory, culture collection):laboratory- Method of cultivation:Bold’s Basal Medium (BBM)ACCLIMATION- Culturing media and conditions (same as test or not):The medium to be used for the growth of algae was Bold’s Basal Medium (BBM). It is a medium composed of macronutrients, micronutrients, alkaline EDTA solution and Iron solution. Stock solution of each of these was prepared separately and then a complete medium was prepared and sterilized. De-ionized water was used to prepare the BBM- Any deformed or abnormal cells observed:no
Test type:
static
Water media type:
freshwater
Total exposure duration:
72 h
Nominal and measured concentrations:
2) Six test concentration (nominal) were:6.25 mg/l, 12.5 mg/l, 25 mg/l, 50mg/l, 100 mg/l and 200mg/l3) Six test concentration were: 6.25 mg/L, 12.5 mg/L, 25 mg/L, 50mg/L, 100 mg/L and 200mg/L (Nominal)
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
> 200 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
cell number
Remarks on result:
other: EC30 was found to be 213.816mg/l graphically and through probit analysis.
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
125.46 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
cell number
Validity criteria fulfilled:
not specified
Conclusions:
The test chemical Sodium 4-{[4-(diethylamino)phenyl][4-(diethyliminio)-2,5-cyclohexadien-1-ylidene]methyl}-6-hydroxy-1,3-benzenedisulfonate is not likely to be toxic to aquatic algae and cyanobacteria atleast in the concentration of 125 - 200 mg/l
Executive summary:

Data available for the structurally similar read across chemicals has been reviewed to determine the toxicity of aquatic algae and cyanobacteria of the test chemical Sodium 4-{[4-(diethylamino)phenyl][4-(diethyliminio)-2,5-cyclohexadien-1-ylidene]methyl}-6-hydroxy-1,3-benzenedisulfonate (20262 -76 -4).The studies are as mentioned below:

1.The effect of test item was studied on the growth of fresh water green algaChlorella vulgaris.The study was conducted following OECD guideline 201- Alga, growth inhibition test. The test concentration chosen for the study were 6.25mg/l, 12.5mg/l, 25mg/l, 50mg/l, 100mg/l and 200mg/l. The test concentrations were prepared using stock solution of the test item using mineral media. The green alga was exposed to the test concentration for a period of 72 hours to observe average specific growth rate and % growth inhibition under the effect of the test item. EC30 calculated graphically through probit analysis was observed to be 213.816mg/l. The EC50 was greater than 200 mg/L.Thus, based on this value, it can be concluded that the test chemicalcan be considered as non-toxic to aquatic organismsand thus cannot be classified as hazardous as per the CLP criteria.

2.The effect of test item was studied on the growth of fresh water green algaChlorella vulgaris.The study was conducted following OECD guideline 201- Alga growth inhibition test. The test concentration chosen for the study were 6.25mg/L, 12.5mg/L, 25mg/L, 50 mg/L, 100mg/L and 200mg/L. The test concentrations were prepared using stock solution of the test item using mineral media. The green alga was exposed to the test concentration for a period of 72 hours to observe average specific growth rate and % growth inhibition under the effect of the test item. EC50 calculated graphically through probit analysis was observed to be 125.46 mg/L.

On the basis of above effect concentration the test material was considered to be not toxic and can not be classified as per CLP classification

Description of key information

Toxicity to aquatic algae and cyanobacteria:

Data available for the structurally similar read across chemicals has been reviewed to determine the toxicity of aquatic algae and cyanobacteria of the test chemical Sodium 4-{[4-(diethylamino)phenyl][4-(diethyliminio)-2,5-cyclohexadien-1-ylidene]methyl}-6-hydroxy-1,3-benzenedisulfonate (20262 -76 -4).The studies are as mentioned below:

1.The effect of test item was studied on the growth of fresh water green algaChlorella vulgaris.The study was conducted following OECD guideline 201- Alga, growth inhibition test. The test concentration chosen for the study were 6.25mg/l, 12.5mg/l, 25mg/l, 50mg/l, 100mg/l and 200mg/l. The test concentrations were prepared using stock solution of the test item using mineral media. The green alga was exposed to the test concentration for a period of 72 hours to observe average specific growth rate and % growth inhibition under the effect of the test item. EC30 calculated graphically through probit analysis was observed to be 213.816mg/l. The EC50 was greater than 200 mg/L.Thus, based on this value, it can be concluded that the test chemicalcan be considered as non-toxic to aquatic organismsand thus cannot be classified as hazardous as per the CLP criteria.

2.The effect of test item was studied on the growth of fresh water green algaChlorella vulgaris.The study was conducted following OECD guideline 201- Alga growth inhibition test. The test concentration chosen for the study were 6.25mg/L, 12.5mg/L, 25mg/L, 50 mg/L, 100mg/L and 200mg/L. The test concentrations were prepared using stock solution of the test item using mineral media. The green alga was exposed to the test concentration for a period of 72 hours to observe average specific growth rate and % growth inhibition under the effect of the test item. EC50 calculated graphically through probit analysis was observed to be 125.46 mg/L.

On the basis of above effect concentration the test material was considered to be not toxic and can not be classified as per CLP classification

Key value for chemical safety assessment

Additional information