Registration Dossier
Registration Dossier
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EC number: 266-002-0 | CAS number: 65996-69-2 The fused substance formed by the action of a flux upon the gangue of the iron-bearing materials charged to a blast furnace and upon the oxidized impurities in the iron produced. Depending upon the particular blast furnace operation, the slag is composed primarily of sulfur and oxides of aluminum, calcium, magnesium, and silicon.
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
ABS and ABS from toploader kiln (3 slags): OECD TG 202, Daphnia magna: 48 h EC0 >= 100 g/L, EC50 > 100 g/L (nominal, highest concentration tested) (Hygiene-Institut des Ruhrgebiets 2002a, 2003, 2008a)
ABS (2 slags): DIN 38412L30, Daphnia magna: 48 h IC50 > 50 g/L and 48 h NOEC >= 50 g/L (neutralized, nominal) (BfG 2008)
ABS: NF EN ISO 6341, Daphnia magna (2 slags): 48 h-IC50 > 90 g/L (nominal) (LECES 1999)
ABS: non-guideline Ceriodaphnia dubia, freshwater: aerobic 48 h-EC50s = 14 g/L (nominal), anaerobic 48 h-EC50s = 13 g/L (nominal) (Julli 1999)
ABS: non-guideline Mimachlamys asperrima, saltwater: aerobic 48 h-EC50 = 200 g/L (nominal), anaerobic 48 h-EC50 = 20 g/L (nominal) (Julli 1999)
GBS: OECD TG 202, Daphnia magna: 48 h-LC0 >= 1000 g/L and LC50 > 1000 g/L (nom., highest tested concentration) (Hygiene-Institut des Ruhrgebiets 2000c)
BOS (2 slags): OECD TG 202, Daphnia magna: 48 h-EC0 = 33 g/L, 48 h-EC50 = 47 g/L and = 52 g/L (nominal) (Hygiene-Institut des Ruhrgebiets 2001a and 2001b)
BOS: non-guideline test, Ceriodaphnia dubia, freshwater: aerobic 48 h-EC50 = 26 g/L (nom.), anaerobic 48 h-EC50s = 37 g/L (nominal) (Julli 1999)
BOS: non-guideline test, Mimachlamys asperrima, saltwater: aerobic 48 h-EC50 = 20 g/L (nom.), anaerobic 48 h-EC50 = 20 g/L (nominal) (Julli 1999)
BOS (2 slags): DIN 38412L30, Daphnia magna: 48 h IC50 > 12.5 g/L and 48 h NOEC > 12.5 g/L (neutralized, nominal) (BfG 2008)
EAF C: OECD 202, Daphnia magna: 48 h-EC0 = 20 g/L, 48 h-EC50 = 45 g/L (nominal) (Hygiene-Institut des Ruhrgebiets 2001c)
EAF C: DIN 38412 L30, Daphnia magna: 48 h NOEC > 80 g/L (neutralized, nominal) (BfG 2008)
EAF C: NF EN ISO 6341, Daphnia magna: 48 h-IC50 > 90 g/L (nominal, highest concentration tested) and 48 h-IC50 = 27 g/L (nominal) (LECES 1999)
EAF S: NF EN ISO 6341, Daphnia magna: 48 h-IC50 = 27 g/L (nominal) (LECES 1999)
SMS (2 slag): OECD TG 202, Daphnia magna: 48 h-EC0 >= 100 g/L, 48 h-EC50 > 100 g/L (nominal) (Hygiene-Institut des Ruhrgebiets 2001f + g)
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 50 g/L
Marine water invertebrates
Marine water invertebrates
- Effect concentration:
- 5 g/L
Additional information
From the 18 reports identified to provide information on the short term toxicity to aquatic invertebrates of ferrous slags, 9 of these studies follow the method described in OECD TG 202. The studies of Reis da Silva et al. 2007were not taken into consideration because OECD TG 202 recommends adjustment of pH (preferably to a pH of 6.0 – 9). The leachates in in the studies ofReis da Silva et al. (2007) werenot neutralised and so most likely alkaline and outside the range given in OECD TG 202. So the effects of pH and eluted compounds cannot be differentiated.
In general it has been shown that ferrous slags of all types tested are not toxic to aquatic invertebrates in short term studies.
Although some 48 h-IC50were below 50 g/L, it is suggested to use the concentration of 50 - 100 g/L for PNEC deriviation.
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