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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
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:
The supporting QMRF report has been attached
Qualifier:
according to
Guideline:
other: estimated data
Principles of method if other than guideline:
The prediction was done by using OECD QSAR tool box v3.3
GLP compliance:
not specified
Specific details on test material used for the study:
- Name of test material (IUPAC name): 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate
- Common name: 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate
- Molecular formula: C18H21N6.C2H3O2
- Molecular weight: 380.4496 g/mol
- Smiles notation: CC(=O)[O-].Cn1cn[n+](c1/N=N/c2ccc(cc2)N(C)Cc3ccccc3)C
- InChl: 1S/C18H21N6.C2H4O2/c1-22(13-15-7-5-4-6-8-15)17-11-9-16(10-12-17)20-21-18-23(2)14-19-24(18)3;1-2(3)4/h4-12,14H,13H2,1-3H3;1H3,(H,3,4)/q+1;/p-1
- Substance type: Organic
Analytical monitoring:
not specified
Vehicle:
not specified
Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
Test type:
static
Water media type:
freshwater
Total exposure duration:
72 h
Key result
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
191.918 mg/L
Nominal / measured:
estimated
Conc. based on:
test mat.
Basis for effect:
growth rate
Remarks on result:
other: other details not available

The prediction was based on dataset comprised from the following descriptors: EC50
Estimation method: Takes average value from the 7 nearest neighbours
Domain  logical expression:Result: In Domain

((((((((((((("a" or "b" )  and ("c" and ( not "d") )  )  and ("e" and ( not "f") )  )  and ("g" and ( not "h") )  )  and "i" )  and "j" )  and ("k" and ( not "l") )  )  and ("m" and ( not "n") )  )  and "o" )  and ("p" and ( not "q") )  )  and ("r" and ( not "s") )  )  and ("t" and ( not "u") )  )  and ("v" and "w" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as Michael addition OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals >> Arenes OR SN1 OR SN1 >> Iminium Ion Formation OR SN1 >> Iminium Ion Formation >> Aliphatic tertiary amines OR SN1 >> Nitrenium Ion formation OR SN1 >> Nitrenium Ion formation >> Aromatic azo OR SN1 >> Nitrenium Ion formation >> Tertiary aromatic amine OR SN1 >> Nitrenium Ion formation >> Unsaturated heterocyclic azo by DNA binding by OECD ONLY

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as Aliphatic Amines by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as No alert found by DNA binding by OASIS v.1.3

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as AN2 OR AN2 >> Schiff base formation by aldehyde formed after metabolic activation OR AN2 >> Schiff base formation by aldehyde formed after metabolic activation >> Geminal Polyhaloalkane Derivatives OR AN2 >> Shiff base formation for aldehydes OR AN2 >> Shiff base formation for aldehydes >> Geminal Polyhaloalkane Derivatives OR Non-covalent interaction OR Non-covalent interaction >> DNA intercalation OR Non-covalent interaction >> DNA intercalation >> DNA Intercalators with Carboxamide Side Chain OR Radical OR Radical >> Radical mechanism via ROS formation (indirect) OR Radical >> Radical mechanism via ROS formation (indirect) >> Geminal Polyhaloalkane Derivatives OR SN2 OR SN2 >> Acylation involving a leaving group  OR SN2 >> Acylation involving a leaving group  >> Geminal Polyhaloalkane Derivatives OR SN2 >> Acylation involving a leaving group after metabolic activation OR SN2 >> Acylation involving a leaving group after metabolic activation >> Geminal Polyhaloalkane Derivatives OR SN2 >> Nucleophilic substitution at sp3 carbon atom after thiol (glutathione) conjugation OR SN2 >> Nucleophilic substitution at sp3 carbon atom after thiol (glutathione) conjugation >> Geminal Polyhaloalkane Derivatives by DNA binding by OASIS v.1.3

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as Non binder, without OH or NH2 group by Estrogen Receptor Binding

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as Moderate binder, OH grooup OR Non binder, impaired OH or NH2 group OR Non binder, MW>500 OR Non binder, non cyclic structure OR Strong binder, OH group OR Weak binder, NH2 group by Estrogen Receptor Binding

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as No alert found by Protein binding by OASIS v1.3

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Acylation OR Acylation >> Ester aminolysis OR Acylation >> Ester aminolysis >> Amides by Protein binding by OASIS v1.3

Domain logical expression index: "i"

Referential boundary: The target chemical should be classified as No superfragment by Superfragments ONLY

Domain logical expression index: "j"

Referential boundary: The target chemical should be classified as Bioavailable by Lipinski Rule Oasis ONLY

Domain logical expression index: "k"

Referential boundary: The target chemical should be classified as Non-Metals by Groups of elements

Domain logical expression index: "l"

Referential boundary: The target chemical should be classified as Alkali Earth OR Metalloids by Groups of elements

Domain logical expression index: "m"

Referential boundary: The target chemical should be classified as Group 14 - Carbon C AND Group 15 - Nitrogen N AND Group 16 - Oxygen O by Chemical elements

Domain logical expression index: "n"

Referential boundary: The target chemical should be classified as Group 16 - Sulfur S by Chemical elements

Domain logical expression index: "o"

Similarity boundary:Target: CC(=O)O{-}.N{+}1(C)C(N=Nc2ccc(N(C)Cc3ccccc3)cc2)N(C)C=N1
Threshold=40%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization

Domain logical expression index: "p"

Referential boundary: The target chemical should be classified as Aliphatic Amines by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "q"

Referential boundary: The target chemical should be classified as Acid moiety by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "r"

Referential boundary: The target chemical should be classified as Aliphatic Amines by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "s"

Referential boundary: The target chemical should be classified as Neutral Organics by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "t"

Referential boundary: The target chemical should be classified as Aliphatic Amines by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "u"

Referential boundary: The target chemical should be classified as Carbonyl Ureas by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "v"

Parametric boundary:The target chemical should have a value of log Kow which is >= 0.117

Domain logical expression index: "w"

Parametric boundary:The target chemical should have a value of log Kow which is <= 3.33

Validity criteria fulfilled:
not specified
Conclusions:
EC 50 value of test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate was estimated to be 191.91 mg/L when Desmodesmus subspicatus (previous name: Scenedesmus subspicatus) alga was exposed to test chemical for 72 hrs.
Executive summary:

Toxicity of test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate (CAS no. 84000-82-4) was estimated by using OECD QSAR tool box v3.3 with log Kow as primary descriptor and considering the seven closest read across substances. When test chemical was exposed for 72 hrs on Desmodesmus subspicatus (previous name: Scenedesmus subspicatus) alga, EC50 value was estimated to be 191.91 mg/L. By considering EC50 value it is concluded that test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate is not toxic to aquatic algae and can be considered as not according to CLP classification criteria.

Description of key information

Toxicity of test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate (CAS no. 84000-82-4) was estimated by using OECD QSAR tool box v3.3 with log Kow as primary descriptor and considering the seven closest read across substances. When test chemical was exposed for 72 hrs on Desmodesmus subspicatus (previous name: Scenedesmus subspicatus) alga, EC50 value was estimated to be 191.91 mg/L. By considering EC50 value it is concluded that test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate is not toxic to aquatic algae and can be considered as not according to CLP classification criteria.

Key value for chemical safety assessment

EC50 for freshwater algae:
191.91 mg/L

Additional information

Predicted data from different sources have been studied to determine toxicity to aquatic algae of target chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate (CAS no. 84000-82-4) and their results are summarized below.

In first study the toxicity of test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate (CAS no. 84000-82-4) was estimated by using OECD QSAR tool box v3.3 with log Kow as primary descriptor and considering the seven closest read across substances. When test chemical was exposed for 72 hrs on Desmodesmus subspicatus (previous name: Scenedesmus subspicatus) alga, EC50 value was estimated to be 191.91 mg/L.

In another study the short-term toxicity of the test substance 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate (CAS no.84000-82-8) to green algae is predicted using Estimation Program Interface (EPI Suite, 2017) ECOSAR version 1.10. On the basis of effects observed in a static freshwater system during a 96 hr exposure, the effect concentration (EC50) for the substance is estimated to be 117.732 mg/L.

By considering both the studies it can be concluded that the test chemical 1,4-dimethyl-5-[[4-[methylbenzylamino]phenyl]azo]-1H-1,2,4-triazolium acetate  can be considered as non-toxic to green algae at environmentally relevant concentrations and can be considered not-classified as per the CLP classification criteria.