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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

NOEC - 0.83 mg/L

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
0.83 mg/L

Additional information

The phthalate esters are1,2-benzenedicarboxylic acids with side chain esters ranging in carbon chain length from C1 to C13.The US EPA High Production Volume (HPV) chemical challenge program has proposed grouping phthalate esters into a single category, divided into 3 sub-categories, this based on the structural similarities of the substances and theirphysicochemical and toxicological properties. These sub-categories are: low molecular weight phthalates, transitional phthalates, and high molecular weight phthalates. The high molecular weight phthalates are defined as being produced from alcohols with straight-chain carbon backbones of >C7 or a ring structure. These include varying mixed isomers of linear and branched diheptyl, dioctyl, dinonyl, didecyl, diundecyl and ditridecyl phthalate. All exhibit low solublity in water and are regarded as being too insoluble to exhibit acute or chronic toxicity. Read-across from closely related phthalates thus appears reasonable and this is supported by the data, below:

 

Toxicity to aquatic algae over a 72 hour exposure period has been investigated according to DIN test methods. Solubilising agents were used to increase exposure concentrations and no effects were observed at 500 mg/L.

 

The inhibitory effect of a phthalate ester with C6 -C10 chain length on the growth of the green alga Scenedesmus subspicatus has been determined in accordance with OECD and EU test methods. No inhibitory effects were observed and the NOEC was 2.8 mg/L.

 

Effect of a phthalate ester with C8 -C10 chain length have also been investigated with algae exposed to the highest achievable concentration of 0.83 mg/L as a water accommodated fraction The substance was not toxic under the test and the NOEC was 0.83 mg/L)