| http://www.w3.org/ns/prov#value | - We therefore propose thatH2CO3 is also an intermediate during phosphoric aciddigestionofcarbonateminerals,XCO3?? H3PO4!through two steps (Fig. 1b):i.e. thisreaction,proceedsXHPO4?? CO2?? H2O,XCO3?? H3PO4!H2CO3!where X is a cation, such as Ca, contained in the carbonatemineral.We infer that the first of these two reaction steps shouldbe associated with little or no net isotopic fraction-ation (incl
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