open access

https://hdl.handle.net/2115/51906

Application of urea adduction technique to polluted urban aerosols for the determination of hydrogen isotopic composition of n-alkanes

英語

urea adduction

2012

Taylor & Francis

International Journal of Environmental Analytical Chemistry

92(3)

302-312

We examined an applicability of an improved urea adduction technique for the determination of hydrogen isotopic composition (δD) of homologous series of n-alkanes present in polluted urban aerosols using GC/TC/IRMS. Unresolved complex mixture (UCM) of hydrocarbons that interferes with accurate isotope measurements of n-alkanes was removed from n-alkane fraction by a urea adduction method. Recoveries of C20 to C30 n-alkanes during the urea adduction procedure were greater than 90% when the concentrations of total n-alkanes exceed 6.1 μg/ml. Our compound-specific D/H ratios confirm the absence of significant hydrogen isotope fractionation in n-alkanes during urea adduction and recovery of the purified n-alkane fraction. We applied this technique to the urban aerosols that contain a large quantity of UCM to measure δD of C20 to C35 n-alkanes in urban aerosols from Tokyo and Sapporo with an accuracy less than 10‰. We found that the δD values widely ranged from -38 to -179‰. Based on the δD values of individual n-alkanes in aerosol samples, we can obtain further information on the sources of aerosol n-alkanes and their source regions, and the atmospheric processes such as long-range transport and atmospheric mixing of air masses of different origin.

学術雑誌論文

Accepted Manuscript

This is an electronic version of an article published in Shinya Yamamoto & Kimitaka Kawamura, Application of urea adduction technique to polluted urban aerosols for the determination of hydrogen isotopic composition of n-alkanes, International Journal of Environmental Analytical Chemistry, 92(3), pp.302-312, 2012. International Journal of Environmental Analytical Chemistry is available online at: http://www.informaworld.com/openurl?genre=article&issn=0306-7319&volume=92&issue=3&spage=302

0306-7319