Carbonates that are widely present in mineral aerosol may interact with gas-phase species through reactions of the form XCO 3 + 2HY + nH 2 O $ XY 2 .nH 2 O + CO 2 + H 2 O (R1), where X = Ca or Mg, Y = NO 3 or Cl, and n is the hydration number of the XY 2 salt. Laboratory investigations of R1 (X = Ca, Y = NO 3 ) indicate that nitric acid is irreversibly acquired by CaCO 3 to form Ca(NO 3 ) 2 in idealized environments that do not contain CO 2 . However, CO 2 is present in the atmosphere and could drive R1 i…
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