Emission of Polycyclic Aromatic Hydrocarbons from Indoor Straw Burning and Emission Inventory Updating in China
Emission of Polycyclic Aromatic Hydrocarbons from Indoor Straw Burning and Emission Inventory Updating in China
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DOI：
10.1196/annals.1454.006
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发表时间：
2008-01-01
期刊：
影响因子：
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通讯作者：
Tao, Shu
中科院分区：
文献类型：
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作者：
Zhang, Yanxu;Dou, Han;Tao, Shu
室内秸秆燃烧的排放因子是估算中国多环芳烃（PAH）排放量的主要数据缺口。秸秆露天燃烧的排放因子借鉴了我们之前的研究，并进行了粗略的估算。秸秆室内燃烧作为我国最重要的排放源之一，需要准确确定和修订排放因子。在这项研究中，收集了中国农村地区具有代表性的秸秆，并在与农村家庭使用的条件相似的条件下进行焚烧。对产生的烟雾进行取样，并通过气相色谱-质量选择检测 (GC-MSD) 分析 PAH 浓度，发现排放因子要高得多。根据新测得的排放因子，更新了室内秸秆燃烧的排放量。此外，最近公布的排放因子被编入一个综合数据库，并包括一些新的来源。此外，排放清单范围扩大至1950年至2005年，尺度分辨率升级至一公里。在更新的清单中，2003年中国16种多环芳烃的排放总量为11.6万吨，其中室内秸秆和木柴燃烧是最主要的来源。虽然机动车尾气排放占总排放量比重较小，但仍是我国城市的主要排放源之一。从1950年开始，PAH排放总量连续四十年增加，但自1990年以来，由于焦炭产量的变化，PAH排放量出现波动。
The emission factors for indoor straw combustion are a major data gap for estimating the polycyclic aromatic hydrocarbon (PAH) emissions in China. The emission factors for open-fire straw burning were borrowed from our previous study and a rough estimate was developed. As one of the most important emission sources in China, the emission factors for indoor straw combustion needed to be determined and revised accurately. In this study, a representative straw in rural China was collected and burned in similar conditions with those used by countryside families. The smoke produced was sampled and the PAH concentrations were analyzed by gas chromatography-mass selective detection (GC-MSD), and much higher emission factors were found. Based on the newly measured emission factors, the emission amount from indoor straw combustion was updated. In addition, recently published emission factors were compiled in a comprehensive database and some new sources were included. Additionally, the emission inventory was extended to cover the period from 1950 to 2005 and upgraded to a scale resolution of one kilometer. In the updated inventory, the total quantity of 16 PAHs emitted from China was 116,000 tons in 2003, with indoor straw and firewood combustions as the most important sources. Although vehicular emission contributed a relatively small percentage of the total emission, it was still one of the major sources in the urban areas of China. The total PAH emission increased continuously for four decades, starting from 1950, but fluctuated since 1990 due to variations in coke production.