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Molecular Distribution and Stable Carbon Isotopic Composition of Dicarboxylic Acids, Ketocarboxylic Acids, and alpha-Dicarbonyls in Size-Resolved Atmospheric Particles From Xi'an City, China
Wang, GH (Wang, Gehui)[1,2]; Kawamura, K (Kawamura, Kimitaka)[1]; Cheng, CL (Cheng, Chunlei)[2]; Li, JJ (Li, Jianjun)[2]; Cao, JJ (Cao, Junji)[2]; Zhang, RJ (Zhang, Renjian)[3]; Zhang, T (Zhang, Ting)[2]; Liu, SX (Liu, Suixin)[2]; Zhao, ZZ (Zhao, Zhuzi)[2]
2012-05-01
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume46Issue:9Pages:4783-4791
Subtype期刊论文
Abstract

Size-resolved airborne particles (9-stages) in urban Xi'an, China, during summer and winter were measured for molecular distributions and stable carbon isotopic compositions of dicarboxylic acids, ketocarboxylic acids, and alpha-dicarbonyls. To our best knowledge, we report for the first time the size-resolved differences in stable carbon isotopic compositions of diacids and related compounds in continental organic aerosols. High ambient concentrations of terephthalic (tPh, 379 +/- 200 ng m(-3)) and glyoxylic acids (omega C-2, 235 +/- 134 ng m(-3)) in Xi'an aerosols during winter compared to those in other Chinese cities suggest significant emissions from plastic waste burning and coal combustions. Most of the target compounds are enriched in the fine mode (<2.1 mu m) in both seasons peaking at 0.7-2.1 mu m. However, summertime concentrations of malonic (C-3), succinic (C-4), azelaic (C-9), phthalic (Ph), pyruvic (Pyr), 4-oxobutanoic (omega C-4), and 9-oxononanoic (omega C-9) acids, and glyoxal (Gly) in the coarse mode (>2.1 mu m) are comparable to and even higher than those in the fine mode (<2.1 mu m). Stable carbon isotopic compositions of the major organics are higher in winter than in summer, except oxalic acid (C-2), omega C-4, and Ph. delta C-13 of C-2 showed a clear difference in sizes during summer, with higher values in fine mode (ranging from -22.8 parts per thousand to -21.9 parts per thousand) and lower values in coarse mode (-27.1 parts per thousand to -23.6 parts per thousand). The lower delta C-13 of C-2 in coarse particles indicate that coarse mode of the compound originates from evaporation from fine mode and subsequent condensation/adsorption onto pre-existing coarse particles. Positive linear correlations of C-2, sulfate and omega C-2 and their delta C-13 values suggest that omega C-2 is a key intermediate, which is formed in aqueous-phase via photooxidation of precursors (e.g., Gly and Pyr), followed by a further oxidation to produce C-2.

DOI10.1021/es204322c
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10164
Collection粉尘与环境研究室
Corresponding AuthorWang, GH (Wang, Gehui)[1,2]
Affiliation1.Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences,Xi’an 710079, China;
3.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Recommended Citation
GB/T 7714
Wang, GH ,Kawamura, K ,Cheng, CL ,et al. Molecular Distribution and Stable Carbon Isotopic Composition of Dicarboxylic Acids, Ketocarboxylic Acids, and alpha-Dicarbonyls in Size-Resolved Atmospheric Particles From Xi'an City, China[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2012,46(9):4783-4791.
APA Wang, GH .,Kawamura, K .,Cheng, CL .,Li, JJ .,Cao, JJ .,...&Zhao, ZZ .(2012).Molecular Distribution and Stable Carbon Isotopic Composition of Dicarboxylic Acids, Ketocarboxylic Acids, and alpha-Dicarbonyls in Size-Resolved Atmospheric Particles From Xi'an City, China.ENVIRONMENTAL SCIENCE & TECHNOLOGY,46(9),4783-4791.
MLA Wang, GH ,et al."Molecular Distribution and Stable Carbon Isotopic Composition of Dicarboxylic Acids, Ketocarboxylic Acids, and alpha-Dicarbonyls in Size-Resolved Atmospheric Particles From Xi'an City, China".ENVIRONMENTAL SCIENCE & TECHNOLOGY 46.9(2012):4783-4791.
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