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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

2EHDPP is a “poorly soluble” substance with tendency to stay undissolved when its concentration exceed the water solubility value. Effects observed in the presence of undissolved test material are not indicative of true toxicity but rather indicates physical effects. 

Key value for chemical safety assessment

Additional information

The available studies on the toxicity to algae of 2EHDPP are listed in the table below:

Algae  

Result

Comment

Reference

Flag and Klimish scores

Green algae

Selenastrum capricornutum 

72- EC50: 0.226 mg/L

Effects only observed at concentrations >solubility

Hughes and Williams (1995a)

Supporting-K3

Green algae

Scenedesmus subspicatus 

72- EC50: 0.120 mg/L

Effects only observed at concentrations >solubility

Hughes and Williams (1995b)

Supporting-K3

Green algae

S. capricornutum 

96- EC50: 0.20 mg/L

Effects only observed at concentrations >solubility

Hollister (1979a)

Supporting-K3

Diatom

Navicula pelliculosa 

72-h EC50: >0.40 mg/L

(Range-finding study only)

Effects only observed at concentrations >solubility

Carolina Ecotox (1994)

Supporting-K3

 

As all measured toxicity values are well above the water solubility (50.6 ug/l) of the substance, 2EHDPP can not be classified as toxic to the environment.