Triple Isotopes (delta C-13, delta H-2, and Delta C-4) Compositions and Source Apportionment of Atmospheric Naphthalene: A Key Surrogate of Intermediate-Volatility Organic Compounds (IVOCs)
Triple Isotopes (delta C-13, delta H-2, and Delta C-4) Compositions and Source Apportionment of Atmospheric Naphthalene: A Key Surrogate of Intermediate-Volatility Organic Compounds (IVOCs)
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大气萘的三重同位素（δ13C、δ2H 和δ14C）成分和来源解析：中挥发性有机化合物 (IVOC) 的关键替代物。
DOI：
10.1021/acs.est.0c00075
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发表时间：
2020
影响因子：
11.4
通讯作者：
Zhang Gan
中科院分区：
文献类型：
--
作者：
Tang Tiangang;Cheng Zhineng;Xu Buqing;Zhang Bolong;Zhu Sanyuan;Cheng Hairong;Li Jun;Chen Yingjun;Zhang Gan
萘（NAP）作为中挥发性有机化合物（IVOC）的替代品，被认为是二次有机气溶胶（SOA）的重要前体。然而，其排放源的相对贡献仍不明确。本研究首先利用三同位素（δ13C、δ2H 和 Δ14C）技术结合贝叶斯模型在中国京津冀（BTH）地区进行了大气 NAP 源解析。在城市站点，NAP的稳定碳（-27.7 ± 0.7 ‰，δ13C）和放射性碳（-944.0 ± 20.4 ‰，Δ14C）同位素组成没有表现出明显的季节变化，但氘系统在冬季（-86.7 ± 8.9 ‰，δ2H）与夏季（-56.4 %）相比表现出相对更多的 2H 贫化特征。 ±3.9‰，δ2H）。放射性碳特征表明，95.1 ± 1.8% 的 NAP 是从这些城市的化石源排放的。贝叶斯模型结果表明，京津冀城市站点的排放源组成具有相似的模式。液体化石燃烧的贡献最高（46.7±2.6%），其次是煤炭高温燃烧（26.8±7.1%）、煤炭低温燃烧（18.9±6.4%）和生物质燃烧（7.6±3.1%）。在郊区站点，煤炭低温燃烧的贡献可达70.1±6.4%。基于三同位素的方法提供了对大气 NAP 来源的自上而下的约束，并且可以进一步应用于环境大气中的其他 IVOC。
Naphthalene (NAP), as a surrogate of intermediate-volatility organic compounds (IVOCs), has been proposed to be an important precursor of secondary organic aerosol (SOA). However, the relative contribution of its emission sources is still not explicit. This study first conducted source apportionment of atmospheric NAP using a triple-isotope (δ13C, δ2H, and Δ14C) technique combined with a Bayesian model in the Beijing-Tianjin-Hebei (BTH) region, China. At the urban sites, stable carbon (-27.7 ± 0.7 ‰, δ13C) and radiocarbon (-944.0 ± 20.4‰, Δ14C) isotope compositions of NAP did not exhibit significant seasonal variation, but the deuterium system showed a relatively more 2H-depleted signature in winter (-86.7 ± 8.9 ‰, δ2H) compared to that in summer (-56.4 % ± 3.9 ‰, δ2H). Radiocarbon signatures indicated that 95.1 ± 1.8 % of NAP was emitted from fossil sources in these cities. The Bayesian model results indicated that the emission source compositions in the BTH urban sites had a similar pattern. The contribution of liquid fossil combustion was highest (46.7 ± 2.6%), followed by coal high-temperature combustion (26.8 ± 7.1%), coal low-temperature combustion (18.9 ± 6.4%) and biomass burning (7.6 ± 3.1%). At the suburban site, the contribution of coal low-temperature combustion could reach 70.1 ± 6.4 %. The triple-isotopes based approach provides a top-down constraint on the sources of atmospheric NAP, and could be further applied to other IVOCs in the ambient atmosphere.