HENRYS LAW AND HYDROLYSIS-RATE CONSTANTS FOR PEROXYACYL NITRATES (PANS) USING A HOMOGENEOUS GAS-PHASE SOURCE

The solubilities and hydrolysis rates of PAN (peroxyacetyl nitrate) and its homologues PPN (peroxypropionyl nitrate), PnBN (peroxy-n-butyl nitrate), PiBN (peroxy-isobutyl nitrate) and MPAN (peroxymethacryloyl nitrate) in liquid water have been studied at 20 degrees C. Temperature dependencies were measured for PAN and PPN. The solubilities of peroxylacyl nitrates decrease smoothly with increasing carbon-chain length from H (293 K) = 4.1 M atm(-1) (PAN) to H (293 K) = 1.0 M atm(-1) (PiBN). Hydrolysis-rate constants, which cover the range from k(h) (293 K) = (2.4-7.4) x 10(-4) s(-1) do not show a systematic chain-length dependency. Solubilities of PAN and PPN in solutions which mimic the composition and ionic strength of sea water are 15% and 20% lower than in pure water. The hydrolysis rate constants are not affected.