Registration Dossier
Registration Dossier
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EC number: 270-659-9 | CAS number: 68475-76-3 A complex combination of finely divided inorganic particles separated from the exit gases formed during the manufacture of Portland cement. The flue dust consists of uncalcined raw materials along with partially calcined materials. Some Portland cement clinker is usually included. The major constituents of kiln dust are calcium carbonate, clays, shales, quartz and sulfate salts. The following materials may also be present:@Dolomite@Ca(OH)2@Feldspars@CaSO4@Fly ash@KCl@Iron oxides@K2CO3@CaF2@K2SO4@CaO@Na2SO4@Glasses of SiO2, Al.s@Portland cement chemicals [659
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 282 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 282 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 28 µg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 6 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 875 µg/kg sediment dw
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 88 µg/kg sediment dw
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 5 mg/kg soil dw
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
PNECaqua (fresh water and marine water)
The PNEC values are based on the acute toxicity testing data and an assessment factor of 1000, acc. to the REACH guidelines. The pH increase seems to play an important role. Generally, laboratory testing solutions have a lower buffer capacity for the pH than natural waters. So, the laboratory testing results will give an overestimation of the toxic effects compared to the field conditions. A reduction of the assessment factor by a factor of 10 should be justifiable. In this case the PNEC values would be 280 µg for freshwater and 28 µg for marine water.
PNEC sediment (fresh water and marine water)
The partitioning method is not applicable for Flue dust to calculate the PNEC sediment values, since the effects are mainly caused by hydroxyl ions (pH). The fate and behaviour of the hydroxyl ions is determined by the pH buffer capacity of the sediment rather than a partitioning coefficient (Kd). Because no test data are available for Flue dust at present, read across to sediment toxicity testing of Portland cement clinker has been applied.
Conclusion on classification
According to Klimisch 1 study results on acute (short-term), chronic (long-term) aquatic toxicity, toxicity on aquatic microorganisms, sediment toxicity and terrestrial toxicity, Flue dust is not classified as an environmental hazard.
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