hydrated aluminium oxide

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Noun1.hydrated aluminium oxide - white crystalline compound that occurs naturally as the mineral gibbsite
gibbsite - white crystalline mineral consisting of aluminum hydroxide; a constituent of bauxite and a source of alumina
hydrated oxide, hydroxide - a compound of an oxide with water
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Phosphate Reserves: Various chemical methods have been devised for determining soil P: (i) Dilute acids dissolve Ca phosphates except apatites; (ii) Concentrated acids dissolve apatites; (iii) Fluorides displace P from the surface of hydrated aluminium oxides and subsequent treatment with alkali displaces it from the surface of hydrated iron oxides; (iv) Reduction solution and iron chelating agent will remove P from below the surface of [Fe.