1Department of Chemistry, Purdue University, 560 Oval Dr. West Lafayette, IN 47907, USA
2Department of Earth and Atmospheric Sciences, Purdue University, 560 Oval Dr. West Lafayette, IN 47907, USA
*currently at: Clarion University of PA, Dept. of Chemistry and Biochemistry, 840 Wood St., Clarion, PA 16214, USA
Received: 08 Apr 2010 – Published in Atmos. Chem. Phys. Discuss.: 22 Apr 2010
Abstract. Isoprene is an important atmospheric volatile organic compound involved in ozone production and NOx (NO+NO2) sequestration and transport. Isoprene reaction with OH in the presence of NO can form either isoprene hydroxy nitrates ("isoprene nitrates") or convert NO to NO2 which can photolyze to form ozone. While it has been shown that isoprene nitrate production can represent an important sink for NOx in forest impacted environments, there is little experimental knowledge of the relative importance of the individual isoprene nitrate isomers, each of which has a different fate and reactivity. In this work, we have identified the 8 individual isomers and determined their total and individual production yields. The overall yield of isoprene nitrates at atmospheric pressure and 295 K was found to be 0.070(+0.025/−0.015). Three isomers, representing nitrates resulting from OH addition to a terminal carbon, represent 90% of the total IN yield. We also determined the ozone rate constants for three of the isomers, and have calculated their atmospheric lifetimes, which range from ~1–2 h, making their oxidation products likely more important as atmospheric organic nitrates and sinks for nitrogen.
Revised: 24 Jun 2010 – Accepted: 25 Jun 2010 – Published: 08 Jul 2010
Lockwood, A. L., Shepson, P. B., Fiddler, M. N., and Alaghmand, M.: Isoprene nitrates: preparation, separation, identification, yields, and atmospheric chemistry, Atmos. Chem. Phys., 10, 6169-6178, doi:10.5194/acp-10-6169-2010, 2010.