Lecture Notes (PDF) - Aqueous and Environmental Geochemistry
Lecture Notes (PDF) - Aqueous and Environmental Geochemistry
Lecture Notes (PDF) - Aqueous and Environmental Geochemistry
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Environmenal <strong>Geochemistry</strong>DM Sherman, University of Bristol2001/2002Significance of Soil pH/AciditySoil pH determines the solubility (<strong>and</strong> bioavailability) ofessential nutrients <strong>and</strong> toxic species (e.g., Al(OH) n3-n).Soil AcidityActive acidity: Acidity associated with the solution phase.Reserve Acidity: all titratable acidity associated with thesolid phase. Two components:Non-exchangeble acidity: bound H + <strong>and</strong> Al 3+ that isnot displaced by concentrated neutral salts.Associated with organics <strong>and</strong> bound Al-OH cations.Exchangeable Acidity: exchangeable Al 3+ in mineralsoils <strong>and</strong> exchangable H + in organic soils.Page ‹#›
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