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Environmental fate & pathways

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Abiotic degradation is specifically needed for organic substances and less relevant for inorganic substances. It can be reasonably assumed that in the aquatic environment the test substance will normally be completely dissociated into its ions.

This conclusion can be based on the justifications of both main components:

Hydrolysis changes the chemical form but does not decompose aluminium and characterization of total aluminium considers all chemical forms. Thus, the concept of degradation of aluminium by hydrolysis is not relevant in the consideration of its environmental fate.

The ions of calcium oxide will react with HCO3- to form water and carbonate ions which react with Ca2+ to form calcium carbonate. Calcium carbonate precipitates and deposits on the sediment. Calcium carbonate is a constituent of natural soils. Depending on the properties of the test medium, calcium oxide will be strongly neutralised in the initial period after application.

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