Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Additional information on environmental fate and behaviour

Administrative data

additional information on environmental fate and behaviour
Type of information:
other: information from textbook
Adequacy of study:
supporting study
Study period:
not applicable (textbook)
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: information from textbook

Data source

Reference Type:
review article or handbook
Scheffer/Schachtschabel - Lehrbuch der Bodenkunde
Scheffer F., Schachtschabel P.
Bibliographic source:
Spektrum Akademischer Verlag GmbH

Materials and methods

Results and discussion

Applicant's summary and conclusion

Natural background concentrations of dissloved aluminium in soil pore water vary with soil pH.
Executive summary:

Aluminium is a component of clay minerals which are decomposed at soil pH values below 5, resulting in an increase of dissolved Al3+in soil pore water. Thus, dissolved aluminium is permanently present in soil pore water, varying with pH.

The natural background concentration of Al3+in soil pore water – as well as the distribution of Al3+between solid matrix and soil pore water – is dependent on soil composition, i.e.:

·       Concentration of humic substances: complexation of Al3+;

·       Cation exchange capacity of the soils: influences the extent to which cations can be adsorbed.

·       Clay mineral content: adsorption of Al3+on the surface of clay minerals leading to the displacement of nutrient minerals from the soil matrix; intercalation of Al3+in intermediate layers of clay minerals accompanied with a reduction of the cation exchange capacity of the soils.

·       pH: below pH 5 Al(III) is present as Al3+. At neutral pH values Al forms poorly soluble crystalline/solid phases.