Compound-Specific Radiocarbon Analysis of Low Molecular Weight Dicarboxylic Acids in Ambient Aerosols Using Preparative Gas Chromatography: Method Development

Compound-Specific Radiocarbon Analysis of Low Molecular Weight Dicarboxylic Acids in Ambient Aerosols Using Preparative Gas Chromatography : Method Development

Low molecular weight dicarboxylic acids constitute a large fraction of atmospheric organic aerosols, which impact atmospheric radiative forcing and hence Earth's climate. Radiocarbon (C-14) is a unique approach to unambiguously distinguishing the relative contributions of biomass-derived and fossil sources. Here, we developed a compound-specific radiocarbon analysis (CSRA) method for individual dicarboxylic acids in atmospheric particulates. Specifically, the method starts with a dibutyl ester derivatization technique, followed by separation and harvesting of single compounds employing AIMS a preparative capillary gas chromatography in sufficient amounts for offline C-14 measurement with accelerator mass spectrometry. The optimized preparative steps yielded recoveries of >60% and purities of >99% for target molecules. The radiocarbon isotope compositions determined for reference standards taken through the entire method agree well with the original composition of each standard (R-2 = 0.9998). The applicability of the approach was demonstrated with ambient aerosol samples representing contrasting air mass regimes. This yielded two radically different yet system-consistent precursor sources. A minimum size of 50 mu g of C of ambient dicarboxylic acids is needed for credible C-14 measurement. The established method for CSRA of dicarboxylic acids demonstrates a new analytical dimension for studies of the source and evolution of atmospheric secondary organic aerosols.

Cheng, Zhineng (författare)
Gustafsson, ÖrjanStockholms universitet,Institutionen för miljövetenskap(Swepub:su)ogust (författare)
Kawamura, Kimitaka (författare)
Jin, Biao (författare)
Zhu, Sanyuan (författare)
Tang, Tiangang (författare)
Zhang, Bolong (författare)
Li, Jun (författare)
Zhang, Gan (författare)
Stockholms universitetInstitutionen för miljövetenskap (creator_code:org_t)

Ingår i:Environmental Science and Technology Letters: American Chemical Society (ACS)8:2, s. 135-1412328-8930

Av författaren/redakt...: Xu, Buqing; Cheng, Zhineng; Gustafsson, Örja ...; Kawamura, Kimita ...; Jin, Biao; Zhu, Sanyuan; visa fler...; Tang, Tiangang; Zhang, Bolong; Li, Jun; Zhang, Gan; visa färre...

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