Abstract Emission factors for speciated volatile organic compounds (VOCs) from maize residue burning were determined in this study based on chamber experiments. Thirty-six VOC species were identified by Gas Chromatography/Mass Spectrometer (GC/MS). They were classified into six groups, including alkanes, alkenes, oxygenated VOCs, halogenated VOCs, aromatics and other. The emission factor for total VOCs was estimated as about 148 mg kg−1 dry mass burned. About 68.4% of the compounds were aromatics. Field samplings of maize residues were conducted to acquire the information of fuel characteristics including fuel loading, fraction of maize residues that were actually burned as well as proximate and elemental analysis of maize residues. The emission factors were then applied to estimate speciated VOC emissions from maize residue open burning at the provincial level in the upper-northern region of Thailand for the year 2014. Total burned area of maize covered an area of about 500,000 ha which was about 4.7% of the total area of upper-northern region of the country. It was found that total VOC emissions released during the burning season (January–April) was about 79.4 tons. Ethylbenzene, m,p-xylene, 1,2,4-trimethylbenzene, acetaldehyde and o-xylene were the major contributors, accounting for more than 65% of total speciated VOC emissions.

中文翻译：

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泰国北部地区露天焚烧玉米残渣排放的挥发性有机化合物

摘要 本研究基于室内试验确定了玉米秸秆燃烧产生的特定挥发性有机化合物（VOCs）的排放因子。通过气相色谱/质谱仪 (GC/MS) 鉴定了 36 种 VOC。它们被分为六类，包括烷烃、烯烃、含氧VOCs、卤化VOCs、芳烃和其他。总 VOC 的排放因子估计为约 148 mg kg-1 干质量燃烧。大约 68.4% 的化合物是芳烃。对玉米残留物进行田间取样，以获取燃料特性信息，包括燃料负荷、实际燃烧的玉米残留物比例以及玉米残留物的近似和元素分析。然后应用排放因子来估算 2014 年泰国上北部地区省级玉米残渣露天燃烧的特定 VOC 排放量。 玉米燃烧总面积约 500,000 公顷，约为 4.7%占该国上北部地区总面积的比例。结果表明，燃烧季节（1 月至 4 月）释放的 VOC 总排放量约为 79.4 吨。乙苯、间、对二甲苯、1,2,4-三甲苯、乙醛和邻二甲苯是主要贡献者，占 VOC 总排放量的 65% 以上。结果表明，燃烧季节（1 月至 4 月）释放的 VOC 总排放量约为 79.4 吨。乙苯、间、对二甲苯、1,2,4-三甲苯、乙醛和邻二甲苯是主要贡献者，占 VOC 总排放量的 65% 以上。结果表明，燃烧季节（1 月至 4 月）释放的 VOC 总排放量约为 79.4 吨。乙苯、间、对二甲苯、1,2,4-三甲苯、乙醛和邻二甲苯是主要贡献者，占 VOC 总排放量的 65% 以上。