Silicic acid (H4SiO4), tetraethyl ester, reaction products with bis(acetyloxy)dibutylstannane

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.001 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.014 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

1.63 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.062 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.006 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

0.05 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

PNEC oral

PNEC value:

0.2 mg/kg food

Assessment factor:

30

Conclusion on classification

Classification and labelling has been based upon the key information for the ecotoxicity endpoints. The results of these studies are as follows:

96 hour LOEC (fish): >5.70 mg/l (Hooftman and De Wolf, 2003)

48 hour EC50 (Daphnia): 1.4 mg/l (Goodband & Mullee, 2010)

72 hour EC50 (algae): 4.1 mg.l^-1(Oldersma, Hanstveit & de Wolf, 2003)

It should also be considered that the substance does not meet the definition of a readily biodegradable substance (Hanstveit 2003).

The 48-hour EC50 (Daphnia) value presented by Goodband & Mullee, 2010, of 1.4 mg/l is suitable for use for classification and labelling and this meets the criteria under 67/548/EEC and EC Regulation 1272/2008 as follows:

67/548/EEC:

R51 and R53: Toxic to aquatic organisms and May cause long-term adverse effects to the aquatic environment.

EC Regulation 1272/2008:

Hazardous to the aquatic environment, Chronic: Category 2; H411 Toxic to aquatic life with long lasting effects.

However, in line with the Summary Record of the Technical Committee on the Classification and Labelling of Dangerous Substances, Meeting on Environmental Effects of Existing Chemicals, Pesticides and New Chemicals, JRC Ispra – January 25 2007, the Final Conclusion reached by the ECB was that Dibutyltin di(acetate) should be classified as N, R50-53 and hence based on the Committee's decision we consider this the overriding classification for this substance.

 

D137,Dibutyltin di(acetate)

CAS: 17523-06-7, EC: 213-928-8

Classification S -phrases /	Toxicity	Degradation	Bioaccumulation	Escape clause
N; R50-53 S 60-61	0.01 < L(E)C50 ≤ 0.1 (mg/l)	Not readily degradable (default in absence of information/ based on analogy with dibutyltin compounds)	log Kow < 3	Not relevant
Specific concentration limits:	Cn≥2.5% : N, R50-53 0.25%≤Cn < 2.5% : N, R51-53 0.025%≤Cn < 0.25% : R52-53