Registration Dossier
Registration Dossier
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EC number: 218-871-2 | CAS number: 2269-22-9
Endpoint summary
Administrative data
Description of key information
Additional information
Aluminium tri-sec-butylate reacts instantaneously with water to form sec-butanol and Al3+ species. The resulting pH being weakly alkaline indicates according to Langmuir et al. 2004 that Al3+ species formed are mainly Al(OH)4-, Al(OH)3 and Al(OH)2+ at pH 8.5.
As a result, aluminium tri-sec-butylate can be assessed for acute and chronic aquatic toxicity by assessing sec-butanol and hardly soluble aluminium3+ species.
Acute aquatic toxicity:
Aluminium is amongst the most common elements in the earth’s crust and can be found in great abundance in aquatic eco systems as well as in terrestrial and sediment environments. The relative contributions of anthropogenic aluminium to the existing natural pools of aluminium in soils and sediments is therefore not relevant either in terms of added amounts or in terms of toxicity. Acute tests on various trophic levels showed no acute aquatic toxicity within the limits of solubility of aluminium 3 +.
The fish, daphnia, and algae acute aquatic toxicity for sec-butanol are (48h LC50 (fish) = 3520 mg/L, 24h EC50 (daphnia) = 2300 mg/L, and 7d EyC3 (algae) > 95 mg/L).As a result, the substance does not meet the criteria for classification according to Regulation (EC) No 1272/2008, Annex I section 4.1.
Chronic aquatic toxicity: According to the Guidance on the Application of the CLP Criteria (ECHA Reference ECHA-09-G-02-EN), if the acute aquatic toxicity is greater than 100 and the substance is rapidly degradable and there is a low potential for bioaccumulation (log Kow sec-butanol = 0.65), the substance should not be classified for Chronic Aquatic Toxicity as is the case here.
In a test with eggs of the brook trout exposed to Aluminium sulphate, the lowest NOEC found for incomplete hatching was 57 µg/L (as total Al at pH 6.5). For aluminium species in a long-term daphnia study no effects were found at 1.1 mg Al/L at pH 7.61. The NOEC for growth rate in fresh water species Monoraphidium dybowskii and Stichococcus sp. is 0.04 mg/L. In salt water micro algae the EC10 for growth rate was 18µg/L. The EC50 in pseudomonas putida is 165 mg/L as Al.
The concept of biodegradation is not applicable to aluminium as being inorganic but due to the ubiquitous abundance of aluminium in the environment, anthropogenic aluminium compounds are generally not of concern.
As a result, the substance does not meet the criteria for chronic classification according to Regulation (EC) No 1272/2008, Annex I section 4.1.
For explanation for using surrogate data in a weight of evidence approach see section 13 IUCLID.
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