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Short-term toxicity to aquatic invertebrates

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Description of key information

Hyrolysis of tin, dioctylbis(2,4-pentanedionato-κO2,κO4)- in water. In due to solubility and toxicity values consideration of the toxicity of 2,4-Pentadione.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
58.6 mg/L

Additional information

Tin, dioctylbis(2,4-pentanedionato-κO2,κO4)- hydrolyses in water directly. The hydrolysis procducts are 2,4-Pentadione and dioctyltin oxide.

The (Q)SAR for dioctyltin oxide shows that the solubility of the compound is lower than the level for toxicity for aquatic inverebrates. So there is no hazard form this compound for inverebrates,

The solubility of the hydrolysis compound 2,4-Pentadione is higher than the level of toxicity for aquatic inverebrates. So the is to evaluate the toxicity of this compound.

The acute toxicity of 2,4-pentanedione was studied in several static tests with Daphnia magna. The

48 h EC50-values obtained from these studies were 34.4 mg/l (nominal), 48 mg/l (measured) and

75 mg/l (nominal) thereby showing good comparability of all tests (Thurston et al. 1985, Mount and

Norberg 1984, Bringmann and Kuehn 1982, Elnabarawy et al. 1986).

For EC/LC50 for freshwater interbrates the geometric mean was calculated:

Study EC50(Pentadione, 48h) / mg/L
Elnabarawy, 1985 75
Bringmann, 1977 100
Bringmann, 1982 40
Mount, 1984 48,5
Thurston, 1985 47,6
   
Geo Mean 58,63

This results is reflected by the unvalid study of IBACON (unvalid in due to determination of the concentration)