Aluminium is the worlds most common metallic element. It constitutes about 8% of the Earth's crust. It occurs in various chemical forms (species) in most rocks and soils, in vegetation and is found in most water supplies and as part of dust particles in the air. Aluminium  is also present in all clays, making it an constituent of cooking vessels since earliest civilization. Evolution of human life and civilisation has developed in an aluminium rich environment.
While aluminium is abundant in the environment, the naturally occurring forms are usually stable and do not interact with the biological processes which go on in living organisms. Under acidic conditions, however, aluminium may be released from rocks and soils in a soluble form which can be absorbed by plants and animals. 

The term "aluminium" was found in the following pages:

Instrument database: B3 Electronic Design - UVI 3000 UV Digester
Link database: Australian Government: National Pollutant Inventory: Manganese & compounds
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Material database: IRMM - Institute for Reference Materials and Measurements - BCR-033 - Superphosphate
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Instrument database: Perkin-Elmer Corp. - Plasma 400 Sequential ICP-OES Spectrometer
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Instrument database: Retsch GmbH - Heavy-Duty Cutting Mill SM 2000
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Instrument database: Varian Inc. (Part A) - SpectrAA 300
Material database: JRC - Joint Research Centre - BCR-483 - Extractable trace elements in sewage sludge amended soil