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Registration Dossier
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EC number: 294-409-3 | CAS number: 91722-09-7 Substance formed during processing of liquid steel or during production of iron castings. Consists primarily of fused silicates and trace elements as oxides as well as trace of alloying elements.
Monitoring data
Administrative data
- Endpoint:
- monitoring data
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1981-1992
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study well documented. Study meets generally accepted scientific principles. Study acceptable for assessment
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 992
Materials and methods
- Principles of method if other than guideline:
- pH measurements in the Wesel-Datteln canal in context with the use of slags as hydraulic engineering material
- GLP compliance:
- no
- Type of measurement:
- other: field study
- Media:
- surface water
Test material
- Reference substance name:
- Slags, steelmaking, converter
- EC Number:
- 294-409-3
- EC Name:
- Slags, steelmaking, converter
- Cas Number:
- 91722-09-7
- Molecular formula:
- ~ Al(n)Ca(m)Fe(o)Mg(p)Mn(q)Si(r)O(3n/2+m+o+p+q+2r)
- IUPAC Name:
- Aluminium-Calcium-Iron-Magnesium-Manganese-Silicium oxide equivalent
- Reference substance name:
- Slags, ferrous metal, blast furnace
- EC Number:
- 266-002-0
- EC Name:
- Slags, ferrous metal, blast furnace
- Cas Number:
- 65996-69-2
- Molecular formula:
- ~ Al(n)Ca(m)Mg(o)Si(p)O(3n/2+m+o+2p)
- IUPAC Name:
- Aluminium-Calcium-Magnesium-Silicium oxide equivalent
- Details on test material:
- slags in form and size of stones (40-160 mm), filter material (32-100 mm), pebbles (45-65 mm)
Constituent 1
Constituent 2
Study design
- Details on sampling:
- map of sampling and construction sites supplied in the study
Results and discussion
Concentrationopen allclose all
- Country:
- Germany
- Location:
- Wesel-Datteln-Kanal
- Substance or metabolite:
- other: pH before construction of channel embarkment
- Conc.:
- 7.8 - 8.4 other: pH
- Country:
- Germany
- Location:
- Wesel-Datteln-Kanal
- Substance or metabolite:
- other: pH at reference site during construction of channel embarkment
- Conc.:
- 8.1 - 8.3 other: pH
- Country:
- Germany
- Location:
- Wesel-Datteln-Kanal
- Substance or metabolite:
- other: pH on-site during construction of channel embarkment
- Conc.:
- >= 8.5 other: pH
- Remarks on result:
- other: L/S was 16.7 (embarkment on slopes) and 44.4 for filter layer
- Details on results:
- The small increase in pH is unlikely to have any effect on the environment.
Any other information on results incl. tables
In regard to the cover layer, the L/S (liquid/solid) is 16.7 L/kg, in regard to the filter layer the L/S is 44.4 L/kg. According to the Landesumweltamt Nordrhein-Westfalen (Environmental Agency of the German Federal State of Northrhine-Westphalia, Merkblaetter Nr. 7, Anforderungen an die Verwendung von Stahlwerksschlacken im Wasserbau, Essen 1996)
Applicant's summary and conclusion
- Conclusions:
- pH increase during construction of channel embarkment is not relevant for the environment
- Executive summary:
5 slags, steelmaking, converter (BOS) were used as a construction material in hydraulic engineering for channel embarkment. As slags have high pH values when leached under laboratory conditions, the pH was monitored before, during and after the construction works. Although the L/S (liquid/solid) was as low as 16.7, the
pH of the channel water was 7.8 - 8.4 before the construction works, 8.1 - 8.3 in reference site during construction werks, and temporarily up to 8.5 during construction works on-site.
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