Source forensics of n-alkanes and n-fatty acids in urban aerosols using compound specific radiocarbon/stable carbon isotopic composition,Environmental Research Letters

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Source forensics of n-alkanes and n-fatty acids in urban aerosols using compound specific radiocarbon/stable carbon isotopic composition
Environmental Research Letters ( IF 6.7 ) Pub Date : 2020-06-23 , DOI: 10.1088/1748-9326/ab8333
Lujie Ren _{1,

2} , Yiyun Wang _{3,

4} , Kimitaka Kawamura ₅ , Srinivas Bikkina ₅ , Negar Haghipour _{3,

6} , Lukas Wacker ₆ , Chandra Mouli Pavuluri ₁ , Zhimin Zhang ₁ , Siyao Yue _{7,

8} , Yele Sun ₇ , Zifa Wang ₇ , Yanli Zhang ₂ , Xiaojuan Feng ₄ , Cong-Qiang Liu ₁ , Timothy I Eglinton ₃ , Pingqing Fu ₁

Affiliation

n-Alkanes and fatty acids are important molecular markers for the source apportionment of organic matter in the atmosphere. Traditional approaches to date have mostly relied upon the source-specific differences in their molecular distributions and carbon preference index. Alternatively, we demonstrate here the use of stable carbon and radiocarbon isotopic composition (δ 13C and Δ14C, respectively) of n-alkanes and n-fatty acids in aerosols from two urban receptor sites (Beijing and Tianjin) in Northeast China to assess their sources in autumn. The Δ14C n -alkanes of C19–C24 and C26–C32 even-carbon homologs (−851 to −708‰) indicate their dominance from fossil fuel combustion. In contrast, the Δ14C of most abundant palmitic acid (C16:0) and stearic acid (C18:0) suggest a larger contribution from nonfossil sources (~91%–94%), mainly due to inputs from cooking, biomass burning and microorganisms. Compared with lower Δ14C of C27 and C31 n-alkanes (−449‰), C29 n-alkane (−241‰) and C20–C30 n-fatty acids (−263‰) showed more contemporary likely due to significant contribution from plant litter and biomass burning that contain more fresh biogenic material. Fossil character of C27–C31 n-alkanes (40%) and C20–C30 n-fatty acids (30%) could be from soil resuspension and/or loess deposits in upwind regions through long-range atmospheric transport.

更新日期：2020-06-23

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