Understanding the mechanism of gaseous nitrous acid emissions from rice paddy soils

• Project/Area Number: 15K21372
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis; Green/Environmental chemistry
• Research Institution: International Christian University
• Principal Investigator: Minejima Chika 国際基督教大学, 教養学部, 准教授 (20550198)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 硝化 / 大気 / HONO / 活性汚泥 / 水田 / 亜硝酸 / ナイトレイト / 窒素酸化物 / 脱窒 / ダイナミックチャンバー / フィルターパック / OH / 土壌 / 発生

Outline of Final Research Achievements

Gaseous nitrous acid, HONO, changes chemically into hydroxyl radical, OH, which is a cleanser of the atmosphere. Despite its importance, its source is not fully understood. I focused on soil, especially rice paddy soils and activated sludge widely used at waste treatment plants as new HONO sources. Fertilizer is applied and water level is managed in the rice paddy, thus nitrification/denitrification processes are unique. Activated sludge is aggregate of nitrifying/denitrifying bacteria. As a result, the amount of HONO emitted by rice paddy soil has non-negligible influence on the atmosphere’s cleansing ability.
Significant amount of HONO emission was confirmed from activated sludge and the main emission process was found out to be biological.

Research Products

• [Presentation] 二酸化窒素と喘息発作の関係における亜硝酸の役割 (Role of nitrous acid in relationship between nitrogen dioxide and asthma attack) (2018)
  • Author(s): 大山正幸, 中島孝江, 峰島知芳, 東賢一, 板野泰之, 竹中規訓
  • Organizer: 日本薬学会第138回年会
• [Presentation] The Measurements of Gaseous Nitrous Acid(HONO) Emission from Bacteria Living in a Wastewater Treatment Plant (2018)
  • Author(s): Moe Tejima, Chika Minejima, Tomoyuki Miyashita, Norimichi Takenaka, Akihiko Terada, Masaaki Hosomi, Masayuki Ohyama, Keiichi Sato.
  • Organizer: Japan ICU Foundation Undergraduate Research day
• [Presentation] GC/MS and IC Analysis of nicotine reacting with HONO ~As the first step of examining the effect of surfactant on carcinogen formation ~ (2018)
  • Author(s): Kena Hiromoto, Chika Minejima, Kazutoshi Sugita, Masayuki Ohyama, Akihiko Terada, Masaaki Hosomi, Keiichi Sato.
  • Organizer: Japan ICU Foundation Undergraduate Research day
• [Presentation] 排水処理施設に生息する細菌由来の亜硝酸ガス発生量測定 (2017)
  • Author(s): 手嶋萌映, 宮下智之, 峰島知芳, 竹中規訓, 寺田昭彦, 細見正明, 大山正幸, 佐藤啓市
  • Organizer: 第58回大気環境学会年会
• [Presentation] 亜硝酸曝露実験動物の肺気腫様変化の直線切片定量法による比較 (2017)
  • Author(s): 大山正幸，安達修一，東賢一，堀江一郎，礒濱洋一郎，峰島知芳，竹中規訓
  • Organizer: 第58回大気環境学会年会
• [Presentation] Where is HONO from? (2016)
  • Author(s): C. Minejima
  • Organizer: Fifteenth Japanese-American Frontiers of Science Symposium
  • Place of Presentation: Irvine California
  • Year and Date: 2016-12-02
• [Presentation] Measurements of Gaseous Nitrous Acid (HONO) Emission from Activated Sludge and Denitrifying Bacteria (2016)
  • Author(s): Chika Minejima, Tomoyuki Miyashita
  • Organizer: Japan Geoscience Union Meeting 2016 International Symposium Program
  • Place of Presentation: Makuhari Messe (Makuhari, Japan)
  • Year and Date: 2016-05-22
• [Presentation] Measurements of nitrous acid (HONO) direct emission from rice paddy soil and its contribution to atmospheric HONO (2015)
  • Author(s): Chika Minejima, Ray Nakane, Kojiro Shimada, Shohei Riya, Keiichi Sato, Masayuki Ohyama, Akihiko Terada, Masaaki Hosomi
  • Organizer: The International Chemical Congress of Pacific Basin Societies 2015 (The Pacifichem 2015 meeting)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 2015-12-15
  • Int'l Joint Research