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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

A 72-hour static test evaluated the toxicity of DIBK to the green algae, Psuedokirchneirella subcapitata.  The test followed OECD 201 and meet 
GLP requirements. The reported 72-hour EC50 value for growth rate was 46.9 mg/L while the 72-hour NOEC for growth was 12.2 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
46.9 mg/L

Additional information

The acute toxicity of 2,6-dimethylheptan-4-one (diisobutyl ketone or DIBK) to the freshwater algae, Pseudokirchneirella subcapitata was evaluated following OECD guidelines (OECD 201) over a 72 -hour exposure period. These data were used to calculate 72 -hour EC50 and NOEC values for growth rate, cell number and biomass. The 72-hour EC50 values for growth rate was 46.9 mg/L with a 95% confidence interval of 27.0 -66.8 mg/L. The 72-hour NOEC for growth rate was 12.2 mg/l.