Registration Dossier
Registration Dossier
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EC number: 931-322-8 | CAS number: 68131-74-8
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The most sensitive EC50 for soil microorganisms is between 8.4 and 17 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 (residues), coal to plants was assessed by Roembke (2008) according to the DIN 38412-L48 (2002); German standard methods for the examination of water, waste water and sludge - Bio-assays (group L) - Part 48: Toxicity test with Arthrobacter globiformis for contaminated solids (L 48). Different ash types originated from combustion of hard coal or lignite with and without co-combustion, respectively, were tested.
During an exposure period of 3h the Arthrobacter globiformis was exposed to different concentrations of ashes (residues), coal.
The most sensitive study is with a ashes (residues), coal with higher content of free lime (FA 6, FA7). Under the conditions of this study EC50 for dehydrogenase activity was not calculated but must be between 8.4 and 17 g/kg soil d. w. Other studies with ashes (residues), coal with higher content of free lime revealed in EC50 greater than 1000 g/kg. In general ashes (residues), coal without higher content of free lime only caused effects on dehydrogenase activity in Arthrobacter globiformis at higher test concentrations. The most critical ashes (residues), coal were found to be fly ashes originated from combustion of hard coal (FA3, FA5). The EC50 of this ash is between 71.4 and 143 g/kg d. w. (FA5). Other critical ashes (residues), coal - fly ashes showed no or only slight dehydrogenase activity reduction at the significant higher concentration of > 1000 g/kg soil dw.
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