Registration Dossier
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EC number: 300-212-6 | CAS number: 93924-19-7 Hollow ceramic spheres formed as a part of the ash in power stations burning pulverized coal. Composed primarily of the oxides of aluminium, iron and silicon and contain carbon dioxide and nitrogen within the sphere.
Toxicity to soil macroorganisms except arthropods
Administrative data
Link to relevant study record(s)
Description of key information
The NOEC is > 333.3 g/kg soil d.w..
Key value for chemical safety assessment
Additional information
On behalf of the VGB PowerTech e. V. the toxicity of ashes to earthworm was assessed by Roembke (2008) according to the ISO guideline 11268-1 (Effects of Pollutants on Earthworms. 1. Determination of Acute Toxicity Using Artificial Soil Substrate, 1997).
The tested fly ash (FA1) was structural related to ash (residues), cenospheres and as cenospheres are a component of fly ash, these results can be used as read across.
During an exposure period of 14 days the earthworm species Eisenia fetida was exposed to different concentrations of the substance in soil, ranging from an substance to soil ratio of 1/32 (3.1% ash, 96.9% soil) up to a substrate consisting only of fly ash (100% ash). The test was conducted in covered glass vessels containing 500 g of substrate and 10 adult earthworms per concentration. After 7 days as well as at the end of the experiment on day 14 the number of earthworms alive and their weight was determined.
The substance only caused mortality in earthworms only at the highest test concentration. The fly ashes showed 100% mortality at a concentration of 1000 g/kg (FA1). The NOEC is > 333 g/kg soil d. w.
Therefore, it can be concluded that the substance is not toxic to soil macroorganisms and adverse effects are only expected in very high concentrations.
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