Stable hydrogen isotope composition of n-alkanes in urban atmospheric aerosols in Taiyuan, China
Stable hydrogen isotope composition of n-alkanes in urban atmospheric aerosols in Taiyuan, China
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太原城市大气气溶胶中正构烷烃的稳定氢同位素组成
DOI：
10.1016/j.atmosenv.2017.01.028
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发表时间：
2017-03
影响因子：
5
通讯作者：
Ling Mu
中科院分区：
文献类型：
--
作者：
Huiling Bai;Yinghui Li;Lin Peng;Xiangkai Liu;Xiaofeng Liu;Chongfang Song;Ling Mu
采用气相色谱-同位素比值质谱法（GC-ISOR MS）测定了太原市采暖期和非采暖期粒径≤10 μm颗粒物中正构烷烃的氢同位素组成（δD），揭示了太原市5个功能区的时空特征，并对大气污染物进行了另一种约束。加热期和非加热期n-C16 ton-C31的δD值分别为−235.9‰ ~ −119.8‰和−231.3‰ ~ −129.2‰，但这两个相似的跨度具有不同的分布特征。在采暖期，非集中供热区与商业区、居民区与工业区的δD分布基本一致，正构烷烃来源于两种或两种以上的排放源。煤烟可能是当地的主要排放源，但不是唯一的来源。在非加热期，各功能区n-C16 ~ C20正构烷烃随碳数的增加D值均减少，而n-C21 ~ C31正构烷烃则无规律。根据n-C18 ~-C22的δD分布，煤烟和机动车尾气可能分别是非集中供热区采暖期和非采暖期正构烷烃的主要来源，汽油机动车尾气可能是正构烷烃的主要来源，冷凝过程中的氢同位素分馏效应可能是商业区采暖期正构烷烃的污染机制;居民区和工业区n-C16 ~ C18的δD分布差异基本一致，表明非采暖期有相似的化石燃料燃烧来源和同位素分馏效应。
The hydrogen isotope compositions (δD) ofn-alkanes associated with particulate matter with a diameter of ≤10 μm from Taiyuan, China, during heating and non-heating periods were measured via gas chromatography–isotope ratio mass spectrometry to reveal the spatial and temporal characteristics of five functional zones and to provide another constraint on atmospheric pollutants. TheδD values ofn-C16ton-C31during the heating and non-heating periods ranged from −235.9‰ to −119.8‰ and from −231.3‰ to −129.2‰, respectively, but these similar spans had different distribution features. During the heating period, theδD distributions between non–central heating and commercial districts were consistent, as were those between residential and industrial districts; then-alkanes came from two or more types of emission sources. Coal soot might be the primary local emission source, but not the only source. During the non-heating period, then-alkanes ofn-C16ton-C20were more depleted in D with the increasing carbon number in all functional zones, but there was no rule forn-C21ton-C31. Specifically, coal soot and vehicle exhaust might be the primary sources ofn-alkanes for non–central heating districts in the heating and non-heating periods, respectively, according to theδD distribution ofn-C18ton-C22; gasoline vehicle exhaust might be ann-alkane source, and the hydrogen isotope fractionation effect during the condensation process should be a pollution mechanism for the commercial district during the heating period; theδD distribution difference ofn-C16ton-C18between the two periods in the residential and industrial districts was consistent, which indicates a similar source of fossil fuel combustion and a similar isotope fractionation effect during the non-heating period.
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挥发对选定正构烷烃氢同位素组成的影响
影响因子：
5.5
作者：
Junji Cao;Xiaofeng Liu;Jianqiang Zhang;Ling Mu
通讯作者：
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影响因子：
5.2
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影响因子：
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作者：
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通讯作者：
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影响因子：
3.4
作者：
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