Solubility and reactivity of peroxyacetyl nitrate (PAN) in dilute aqueous salt solutions and in sulphuric acid

The loss rates of PAN in several dilute aqueous salt solutions (NaBr, Na2SO 3, KI, NaNO2, FeCl3, and FeSO4) and in sulphuric acid were measured at 279 K with a simple bubbler experiment. They are little different from that in pure water. For 5 M sulphuric acid hydrolysis and solubility were determine d in the temperature range of 243-293 K. The hydrolysis rate k(h) = 3.2 x 1 0(-4) s(-1) at 293 K is close to that in water. The observed temperature de pendence of the Henry's Law constant H = 10(-6.6+/-0.6)exp((4780 +/- 420)/T ) M atm(-1) leads to enthalpy and entropy of solvation Delta H-solv = - 39. 7 +/- 3.5 kJ mol(-1) and Delta S-solv = -126 +/- 11 J mol(-1) K-1, respecti vely. (C) 2000 Elsevier Science Ltd. All rights reserved.