Measurement report: Amino acids in fine and coarse atmospheric aerosol:     concentrations, compositions, sources and possible bacterial degradation state

doi:10.5194/acp-2020-534

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-534
	Measurement report: Amino acids in fine and coarse atmospheric aerosol: concentrations, compositions, sources and possible bacterial degradation state
	Ren-guo Zhu, Hua-Yun Xiao, Li Luo, Hongwei Xiao, Zequn Wen, Yuwen Zhu, Xiaozheng Fang, Yuanyuan Pan, and Zhenping Chen
	2020-07-23
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	The size distribution of amino acids (AAs) in atmospheric particles determines the atmospheric allergenicity, which may have deleterious effects on human health. This paper explores the use of compound-specific δ¹⁵N patterns of hydrolyzed amino acid (HAA), δ¹⁵N values of total hydrolyzed amino acid (THAA), degradation index (DI), and the variance within trophic AAs (ΣV) as markers to examine the sources and processing history of different sizes particle in the atmosphere. 2-weeks of daily aerosol samples from five sampling sites in the Nanchang area (Jiangxi Province, China) and samples of main emission sources of AAs in aerosols (biomass burning, soil and plants) were collected (Zhu et al., 2020). Here, we measured the concentrations and δ¹⁵N values of each HAA in two size segregated aerosol particles (> 2.5 μm and PM_2.5). Our results showed that the average concentrations of THAA in fine particles was nearly 6 times higher than that in coarse particles (p < 0.0.1) and composition profiles of fine and coarse particles were quite different from each other. The δ¹⁵N values of hydrolyzed glycine (Gly) in both fine (−1.0 ‰ to +20.3 ‰) and coarse particles (−0.8 ‰ to +15.7 ‰) exhibited wide ranges, but both fall within the ranges of Gly from biomass burning, soil and plant sources. Similarly, δ¹⁵N values of THAA in both fine (+0.7 ‰ to +13.3 ‰) and coarse particles (−2.3 ‰ to +10.0 ‰) were typically in the range of THAA from these three emission sources. Moreover, the average difference in the δ¹⁵N_THAA value between fine and coarse particles was smaller than 1.5 ‰. These results suggested that the sources of atmospheric AAs for fine and coarse particles might be similar, which are dominated by AAs from biomass burning, soil, and plant sources. Meanwhile, compared to fine particles, significantly lower DI values (p < 0.05), scattered δ¹⁵N distribution in Trophic-AA and higher ΣV values (p < 0.05) were observed in coarse particles. But the difference in δ¹⁵N values of Source-AA (Gly, Ser, Phe and Lys) and THAA (δ¹⁵N_THAA) between coarse particles and fine particles was relatively small. It is likely that AAs in coarse particles have advanced bacterial degradation state compared to fine particles. Besides that, the significant increase in DI values and a decrease in ΣV values for coarse particles were observed at the onset of the rainfall events (p < 0.05). This implies that fresh AAs in coarse particles were mainly released at the onset of the precipitation and decayed swiftly.
领域	地球科学
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/286693
专题	地球科学
推荐引用方式 GB/T 7714	Ren-guo Zhu, Hua-Yun Xiao, Li Luo, Hongwei Xiao, Zequn Wen, Yuwen Zhu, Xiaozheng Fang, Yuanyuan Pan, and Zhenping Chen. Measurement report: Amino acids in fine and coarse atmospheric aerosol: concentrations, compositions, sources and possible bacterial degradation state[J]. Atmospheric Chemistry and Physics,2020.
APA	Ren-guo Zhu, Hua-Yun Xiao, Li Luo, Hongwei Xiao, Zequn Wen, Yuwen Zhu, Xiaozheng Fang, Yuanyuan Pan, and Zhenping Chen.(2020).Measurement report: Amino acids in fine and coarse atmospheric aerosol: concentrations, compositions, sources and possible bacterial degradation state.Atmospheric Chemistry and Physics.
MLA	Ren-guo Zhu, Hua-Yun Xiao, Li Luo, Hongwei Xiao, Zequn Wen, Yuwen Zhu, Xiaozheng Fang, Yuanyuan Pan, and Zhenping Chen."Measurement report: Amino acids in fine and coarse atmospheric aerosol: concentrations, compositions, sources and possible bacterial degradation state".Atmospheric Chemistry and Physics (2020).