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Registration Dossier
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EC number: 266-007-8 | CAS number: 65996-74-9 The oxidized surface of steel produced during reheating, conditioning, hot rolling, and hot forming operations. This substance is usually removed by process waters used for descaling, roll and material cooling, and other purposes. It is subsequently recovered by gravity separation techniques. Composed primarily of high-purity iron oxides. May contain varying amounts of other oxides, elements, and trace compounds.
Additional physico-chemical information
Administrative data
- Endpoint:
- other: transformation dissolution test
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: OECD guidelines are followed.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Environment, Health and Safety Publications-Series on Testing and Assessment, 29)
- Deviations:
- yes
- Remarks:
- pH 8 medium only (buffer prepared according to ISO 6341)
- GLP compliance:
- not specified
Test material
- Reference substance name:
- Mill scale (ferrous metal)
- EC Number:
- 266-007-8
- EC Name:
- Mill scale (ferrous metal)
- Cas Number:
- 65996-74-9
- Molecular formula:
- Not available (see remarks field below)
- IUPAC Name:
- Mill Scale (ferrous metal)
Constituent 1
Results and discussion
- Results:
- After 7 days test, at pH 8.09,measurments show that the mill scale does not undergo dangerous transformation.
Any other information on results incl. tables
Results of the transformation/dissolution test are provided in the following table:
Duration test |
7 days |
pH |
8.09 |
Element |
Content in (mg/L) |
Al |
0.005 |
Cr |
<0.001 |
Cu |
<0.001 |
Si |
1.462 |
Ti |
0.002 |
Fe |
0.01 |
Mn |
0.046 |
Ni |
0.005 |
Zn |
<0.01 |
Applicant's summary and conclusion
- Conclusions:
- The results on the short term (7 days) transformation/dissolution test demonstrate that in the range of the measured pH-values the metals are only partly dissolved in the buffered aqueous medium (exception for Si)
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