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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

A growth rate of algae was measured at an ErC50 of 157.4 mg/L and a NOEC[r] at 100 mg/L was calculated (Neuhahn, 2012). 

Key value for chemical safety assessment

EC50 for freshwater algae:
157.4 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

The test item consists of two components DEG-monophthalate and DEG-bisphthalate. The results for both individual components as well as its sum are reported.

In order to test acute toxicity of algae, Desmodesmus subspicatus, of the test substance were exposed to the test solution of five nominal concentrations of the test substance ( 6.3, 12.5, 25, 50 and 100 mg/L) and blank control solution for a period of 72 h under static conditions. The cell densities were measured at 24 hour intervals. Inhibition of the algal population was measured as reduction in growth rate (index r), relative to control cultures grown under identical conditions. The measured concentrations confirmed that deviation from the nominal concentrations was less than 30 % (measured concentrations were in the range of 95.5 - 101.4 % of nominal concentrations). An ErC50 of 157.4 mg/L was determined and a NOEC[r] of 100 mg/L was calculated.

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