α-Pinene nitrates: synthesis, yields and atmospheric chemistry 1Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, 47907, USA
05 Jul 2011
2Department of Earth and Atmospheric Sciences, Purdue University, 550 Stadium Mall Dr.,West Lafayette, IN 47907, USA
Received: 01 February 2011 – Published in Atmos. Chem. Phys. Discuss.: 28 February 2011 Abstract. The biogenic volatile organic compound α-pinene is one of the
dominant monoterpenes emitted to the Earth's atmosphere at an estimated rate
of ~50 Tg C yr−1. Its atmospheric oxidation products in the
presence of NO can lead to ozone production, as well as production of
secondary organic aerosol (SOA). The major oxidation pathway of α-pinene is reaction with OH, which in the presence of NO can form either
α-pinene nitrates or convert NO to NO2, which can photolyze to
form ozone. In this work, we successfully synthesized four α-pinene
hydroxy nitrates through three different routes, and have identified these 4
individual isomers in α-pinene/OH/NO reaction chamber experiments.
From the experiments, we determined their individual production yields,
estimated the total RONO2 yield, and calculated the relative branching
ratios of the nitrate precursor peroxy radicals (RO2). The combined
yield of the four α-pinene nitrates was found to be 0.130 (±0.035) at
atmospheric pressure and 296 K, and the total organic nitrate
yield was estimated to be 0.19 (+0.10/−0.06). We also determined the OH rate
constants for two of the isomers, and have calculated their overall
atmospheric lifetimes, which range between 22 and 38 h.
Revised: 03 June 2011 – Accepted: 21 June 2011 – Published: 05 July 2011
The Final Revised Paper was retracted
Citation: Ma, S. X., Rindelaub, J. D., McAvey, K. M., Gagare, P. D., Nault, B. A., Ramachandran, P. V., and Shepson, P. B.: α-Pinene nitrates: synthesis, yields and atmospheric chemistry, Atmos. Chem. Phys., 11, 6337-6347, doi:10.5194/acp-11-6337-2011, 2011.