Henry's law constant and hydrolysis of peroxyacetyl nitrate (PAN) |
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Authors: | Jost Kames Silke Schweighoefer Ulrich Schurath |
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Affiliation: | (1) Institut für Physikalische Chemie der Universität Bonn, Wegelerstr. 12, D-5300 Bonn 1, F.R.G. |
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Abstract: | The effect of temperature on the solubility of PAN and on its hydrolysis rate in near-neutral and slightly acidic water were studied in a bubble column apparatus. The results obtained are a Henry's law coefficient H=10–9.04±0.6 exp[(6513±376)/T] M atm–1, and a first-order hydrolysis rate constant k=106.60±1.0 exp[(–6612±662)/T] s-1, which was independent of pH in the range 3.2 pH 6.7. The products formed are nitrite and nitrate in approximately equal proportions under near-neutral conditions. At a pH<4, nitrite is oxidized in a secondary reaction, and nitrate becomes the only product at low pH. Previously measured deposition velocities of PAN on stagnant water surfaces are shown to be hydrolysis rate limited. |
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Keywords: | Peroxyacetyl nitrate (PAN) solubility hydrolysis |
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