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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Based on nominal concentrations the 72-hour EC50 values for growth rate Selenastrum capricornutum was estimated to be 166 mg/L (closed system) and 213 mg/L (open system), based on measured values of 1,2-dichlorethane. 

Key value for chemical safety assessment

EC50 for freshwater algae:
166 mg/L

Additional information

The acute toxicity of 1,2-dichloroethane upon the growth of a freshwater green alga (Selenastrum capricornutum) was observed over a period of 72 hours in a static test according to OECD guideline 201 adapted for volatile substances (closed system enriched in CO2). The EC50 for biomass was determined to be 166 mg/L.

Further on, the following additional information on toxicity to algae and cyanobacteria is available:

Species

EC50

Author

Haematococcus pluvialis

> 1000 mg/L (24 h)

(change in photosynthetic oxygen production)

Krebs, F. (1985)

Desmodesmus subspicatus

412 mg/L TT (7 days)

Trenel, J. & Kuehn, R. (1982)

Desmodesmus subspicatus

710 mg/L TT (8 days)

Bringmann, G. % Kuehn, R. (1980)

Skeletonema costatum

> 433 mg/L (96 h)

Syracuse Res. Corp. (1978)

Mycrocytis aeruginosa

105 mg/L TT (8 days)

Bringmann, G. & Kuehn, R. (1978)

Phaeodactylum tricornutum

340 mg/L

(primary productivity)

Pearson, C.R.et al.(1975)

Desmodesmus subspicatus

189 mg/L

Freitag, D.et al.(1994)

Haematococcus pluvialis

130 mg/L

(inhibition of oxygen production)

Knie, J. (1983)

Reference list

Bringmann, G. & Kuehn, R. (1978): Vom Wasser 50, 45 - 60.

Bringmann, G. & Kuehn, R. (1980): Water Research 14, 231 - 241.

Freitag, D., Ballhorn, L., Behechti, A., Fisher, K. & Thumm, W. (1994): Structural configuration and toxicity of chlorinated alkanes; Chemosphere 282: 253-259.

Knie, J., Haelke, A., Juhnke, I., Schiller, W. (1983): Ergebnisse der Untersuchungen von chemischen Stoffen mit vier Biotests; Dtsch. Gewaesserkundl. Mitt. 27(3), 77-79.

Krebs, F. (1985): Bundesanstalt fuer Gewaesserkunde, 59 - 64, 73 - 75.

Pearson, C.R. & McConnell, G. (1975): Chlorinated C1 and C2 hydrocarbons in the marine environment. Proc. R. Soc. London, Ser. B. 189 (1096), 305-332.

Trenel, J. & Kuehn, R. (1982): Inst. Wasser-, Boden-, Lufthyg. Bundesgesundheitsamt, Juli 1982, 12 - 14, 25 - 27, Anlage 2 (23 - 28), Anlage 4 (1 - 5).

Syracuse Res. Corp. (1978): NTIS/OTS 0511060 # 40-7848049.