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Emissions of gaseous pollutants from laboratory-based fires of vegetation from five common vegetation types in Western Australia
Atmospheric Pollution Research ( IF 4.5 ) Pub Date : 2020-04-04 , DOI: 10.1016/j.apr.2020.03.015
Trang T.T. Dong , Andrea L. Hinwood , Anna C. Callan , William D. Stock

This study investigated emission factors (EFs) for CO2, CO, NO and carbonyls from laboratory-based combustion of five typical vegetation types of Western Australia. A range of combustion conditions was obtained by controlling the vegetation moisture content and air flow rate. CO2, CO and NO were measured using a multi-gas monitor MultiRAE. Six carbonyls were collected using 2,4-DNPH sorbent tubes and analysed using HPLC-UV.

Burns of woodland (Banksia) and forest (Jarrah) had significantly higher EFCO, with lower modified combustion efficiency (MCE) than those of tropical grass (Spinifex). Temperate grass (Veldt) fires had lower EFCO2 and higher EFCO and EFcarbonyls, and a much lower MCE than those of the tropical grass fires. EFNO were similar for woodland, forest and tropical grass but large differences in EFNO were observed for Spinifex and Veldt grass. Formaldehyde was the most abundant carbonyl emitted.

Combustion conditions influenced the EFcarbonyls with larger EFs from burns with higher fuel moisture contents and/or at higher flow rates. Functions to extrapolate EFs for infrequently measured carbonyls (acetaldehyde, acetone and propionaldehyde) from EFformaldehyde were developed. The EFCO2 and EFCO were similar to values reported from field measurements for similar ecosystems in Australia, indicating the applicability of these laboratory-based results. EFs for other gases differed to those reported from bushfires in other parts of the world suggesting that to improve prediction of bushfire emissions and impacts in Australia, EFs of all fire-prone Australian vegetation types should be determined, particularly for those in close proximity to densely populated areas.



中文翻译:

西澳大利亚州五种常见植被类型的实验室植被燃烧产生的气态污染物的排放

这项研究调查了西澳大利亚州五种典型植被类型的实验室燃烧产生的CO 2,CO,NO和羰基的排放因子(EFs)。通过控制植物的水分含量和空气流速可以得到一系列的燃烧条件。使用多气体监测仪MultiRAE测量CO 2,CO和NO。使用2,4-DNPH吸附管收集六种羰基,并使用HPLC-UV分析。

与热带草(Spinifex)相比,林地(Banksia)和森林(Jarrah)的燃烧具有更高的EF CO,改良的燃烧效率(MCE)更低。温带草(Veldt)火具有较低的EF CO2和较高的EF CO和EF羰基,并且MCE远低于热带草火。林地,森林和热带草的EF NO相似,但Spinifex和Veldt草的EF NO差异很大。甲醛是释放出的最丰富的羰基。

燃烧条件以较高的燃料水分和/或较高的流量燃烧而影响了具有较大EF的EF羰基。开发了从EF甲醛中推断不经常测量的羰基化合物(乙醛,丙酮和丙醛)的功能。EF CO2和EF CO与澳大利亚类似生态系统的实地测量报告的值相似,表明这些基于实验室的结果的适用性。其他气体的EFs与世界其他地区的森林大火所报告的EFs不同,这表明,为了改善对澳大利亚森林大火排放和影响的预测,应确定澳大利亚所有易火的植被类型的EFs,尤其是对于那些密密麻麻的植物人口稠密的地区。

更新日期:2020-04-04
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