Registration Dossier

Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1992
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study using national guidelines. Study meets generally accepted scientific principles. Study acceptable for assessment

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
1992

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: DIN 38414-4:1984-10 German standard methods for the examination of water, waste water and sludge; sludge and sediments (group S); determination of leachability by water (S4)
Deviations:
not specified
Principles of method if other than guideline:
pH measurement with standard laboratory equipment (pH electrode)
GLP compliance:
no
Remarks:
FEhS uses national guidelines and has several SOP (standard operation procedures)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Blast furnace slags can crystallize depending on the chemical composition, pH value and cooling velocity. The structure of the solid liquid is to some extend crystalline, with the minerals embedded in a vitreous matrix. The slower the cooling process, the more crystalline structures will be formed. Slags are very similar to natural rocks, e.g. basalt or granite.

Results and discussion

pH valueopen allclose all
pH value:
11
Temp.:
20 °C
Concentration:
ca. 100 g/L
Remarks on result:
other: result reported for ABS
pH value:
10
Temp.:
20 °C
Concentration:
ca. 100 g/L
Remarks on result:
other: result reported for GBS

Applicant's summary and conclusion

Conclusions:
Leachates of cooled blast furnace slags are basic.
Executive summary:

The pH of leachates according to DIN 38414 DEV S4 (100 g/L) of air-cooled blast furnace slags (ABS) is (approximately) 11, and the pH of leachates of granulated blast furnace slags is (approximately) 10.