Indicators for biomass burning source discrimination in PM2.5

2021 Fiscal Year Final Research Report

• Project/Area Number: 18K18204
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 63040:Environmental impact assessment-related
• Research Institution: Osaka Prefecture University
• Principal Investigator: Fujii Yusuke 大阪府立大学, 人間社会システム科学研究科, 助教 (90780099)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: Lignin pyrolysis / Biomass burning / PM2.5 / Rice husk / Rice straw / Peatland fire

Outline of Final Research Achievements

In this study, guaiacyl-, syringyl-, and p-hydroxyphenyl-lignin pyrolysis products in fine particulate matter (especially, PM2.5) emitted from biomass burning (rice husk burning, rice straw burning, and peatland fire) were analyzed by gas chromatography-mass spectrometry. Emission factors and source profiles regarding lignin pyrolysis products were clearly different among biomass burning sources. Thus, lignin pyrolysis products are expected to be used as indicators for biomass burning source discrimination. Then, many lignin pyrolysis products were detected in PM2.5 samples collected in Vietnam and Malaysia.

Free Research Field

大気環境科学

Academic Significance and Societal Importance of the Research Achievements

バイオマス燃焼はPM2.5を含む微小粒子状物質の主要な発生源であるが、国内のバイオマス燃焼に関する研究事例は少なく、バイオマス燃焼による大気汚染の全国的な実態解明が求められており、本研究はその実態解明に繋がる内容である。また、一般的なバイオマス燃焼の発生源指標としてカリウムやレボグルコサンが用いられることが多いが、これらのみでPM2.5に寄与するバイオマス燃焼発生源の種類まで特定することは極めて難しい。それに対し、本研究を通してリグニンの多様な熱分解生成物が各種バイオマス燃焼の指標になり得ることを示すことができた。