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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: scientifically accepted calculation method

Data source

Reference
Reference Type:
other: estimation software
Title:
Unnamed
Year:
2000

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: REACH guidance on QSAR R.6, May 2008
Deviations:
not applicable
Principles of method if other than guideline:
The computer program ECOSAR (v1.00) by US-EPA is used for this estimation. ECOSAR is a scientifically accepted calculation method for organic chemicals; it estimates the toxicity of chemicals discharged to water and predicts beside the acute (short-term) toxicity also the chronic (long-term or delayed) toxicity of a chemical.
GLP compliance:
no
Remarks:
not applicable

Test material

Constituent 1
Chemical structure
Reference substance name:
2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-((hexyl)oxy)phenol
EC Number:
411-380-6
EC Name:
2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-((hexyl)oxy)phenol
Cas Number:
147315-50-2
Molecular formula:
C27H27N3O2
IUPAC Name:
2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-((hexyl)oxy)phenol
Test material form:
not specified
Details on test material:
SMILES notation: CCCCCCOc1cc(O)c(cc1)c2nc(nc(n2)c3ccccc3)c4ccccc4

Sampling and analysis

Analytical monitoring:
not required

Test solutions

Vehicle:
no

Test organisms

Test organisms (species):
other: Green algae; detailed species not reported

Study design

Test type:
other: calculation
Water media type:
freshwater
Total exposure duration:
96 h

Test conditions

Reference substance (positive control):
not required

Results and discussion

Effect concentrations
Duration:
96 h
Dose descriptor:
EC50
Effect conc.:
0.2 mg/L
Nominal / measured:
estimated
Conc. based on:
not specified
Basis for effect:
growth rate
Remarks on result:
other: no algal cell growth inhibition up to its limit of solubility in water
Details on results:
Due to its very low water solubility the substance may not be soluble enough to measure this predicted effect. Further, as the logKow is greater than 5 and the LC50 exceeds the water solubility by factor 10 or more, no effects at saturation are predicted.

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
EC50 for green algae (96h) = 0.20 mg/L, but the substance may not be soluble enough to measure this predicted effect.
Executive summary:

The short-term toxicity value (acute) of the substance of interest for green algae was determined by calculation. This calculation was performed by the computer program form US-EPA (EPIWIN software ECOSAR v1.00); result: EC50(96 h) for green algae = 0.20 mg/L.

Nevertheless, the water solubility (IUCLID section 4.8) and the logKow (IUCLID section 4.7) of a chemical should be compared with the predicted toxicity value derived for a chemical. If the logKow (7.1) is greater than 5 and the LC50 exceeds the measured or predicted maximum water solubility (<0.0003 mg/L) by factor 10 or even more then an effect is not expected to occur in a saturated solution.