Understanding the nature of atmospheric acid processing of mineral dusts in supplying bioavailable phosphorus to the oceans.

ABSTRACT: Acidification of airborne dust particles can dramatically increase the amount of bioavailable phosphorus (P) deposited on the surface ocean. Experiments were conducted to simulate atmospheric processes and determine the dissolution behavior of P compounds in dust and dust precursor soils. Acid dissolution occurs rapidly (seconds to minutes) and is controlled by the amount of H⁺ ions present. For H⁺ < 10^-4 mol/g of dust, 1-10% of the total P is dissolved, largely as a result of dissolution of surface-bound forms. At H⁺ > 10^-4 mol/g of dust, the amount of P (and calcium) released has a direct proportionality to the amount of H⁺ consumed until all inorganic P minerals are exhausted and the final pH remains acidic. Once dissolve

SUBMITTER: Stockdale A 

PROVIDER: S-EPMC5187673 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature