Isoprene oxidation products

Biesenthal, T. A., and P. B. Shepson, Observations of Anthropogenic Inputs of the Isoprene Oxidation Products Methyl Vinyl Ketone and Methacrolein to the Atmosphere, Geophys. Res. Lett., 24, 1375-1378 (1997). 

Helmig, D., J. Greenberg, A. Guenther, P. Zimmerman, and C. Geron, Volatile Organic Compounds and Isoprene Oxidation Products at a Temperate Deciduous Forest Site, . 1. Geophys. Res., 103, 22397-22414 (1998b). 

Kleno, J. and Wolkoff, P. (2004) Changes in eye blink frequency as a measure of trigeminal stimulation by exposure to limonene oxidation products, isoprene oxidation products and nitrate radicals. International Archives of Occupational and Environmental Health, 77 (4), 235-43. 

Kinetics of reactions of isoprene oxidation products with OH and O3... 

This high reactivity towards the important atmospheric photo-oxidants, probably valid also for similar isoprene oxidation products like unsaturated hydroxy carbonyls, hydroxy nitrates or hydroxy hydroperoxides, is an indication that these reactions need more consideration in laboratory experiments as well as photooxidation models. 

Similarly, the isomeric isoprene oxidation products, methyl vinyl ketone and methacrolein, could also be distinguished by adjusting CID voltage in the PTR-LIT-MS. Their limits of detection are about 100 ppt. 

Table 1 Abbreviations and structural formulas associated with isoprene oxidation products...

The role of isoprene chemistry in controlling atmospheric composition and climate, and the influence of temperature and land use change on isoprene emissions, should not be underestimated. The field observations of OH in isoprene-rich, NO c-poor environments discussed above indicate that isoprene has a considerably smaller effect on OH concentrations than chemistry models predict. This conclusion, based on direct measurements of OH and comparison with model predictions, is also supported by observations of other atmospheric species undertaken in VOC rich NO poor environments. Discrepancies between isoprene concentration measurements and model predictions when constrained to isoprene emission inventories have been reported, as have discrepancies between model predictions of isoprene oxidation product concentrations and those measured. Large model underestimates of OH reactivity and SOA formation under isoprene-rich conditions also point towards significant uncertainties in the OH-initiated isoprene oxidation mechanism. 

Altieri KE, Carlton AG, Lim HJ, Turpin BJ, Seitzinger SP (2006) Evidence for oligomer formation in clouds reactions of isoprene oxidation products. Environ Sci Technol 40 4956 960... 

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