Cyclic methylsiloxanes and related compounds in the water environment: assessment of their persistent property and occurrence of total organic silicon

• Project/Area Number: 16K16189
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Center for Environmental Science in Saitama
• Principal Investigator: Horii Yuichi 埼玉県環境科学国際センター, 化学物質・環境放射能担当, 専門研究員 (30509534)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: メチルシロキサン / 有機ケイ素 / 東京湾流域 / 環境分析 / 環境技術 / シロキサン / 水環境 / 下水 / パーソナルケア製品 / 環境動態 / PBT

Outline of Final Research Achievements

In this study, we conducted environmental monitoring for volatile methylsiloxanes (MSs) and related compounds and their risk assessment in water and sediment environment from Tokyo Bay watershed. In river water monitoring, the concentration profiles of methylsiloxanes for over five-years including previous data were determined and were analyzed for understanding its time trend. Owing to their persistence in the environment and high adsorption onto organic carbon, sediment is considered as final sink for MSs in aquatic environment. To investigate occurrence and fate of a wide range of MSs, we simultaneously measured 35 MSs, including 7 cyclic MSs, 13 linear MSs, and 15 other MSs (e.g. hydrogen-, vinyl-, and phenyl-modified) in river sediment samples. Moreover, total organic silicon (TOSi) was tried to use as indicator for understanding the environmental distribution for whole silicone compounds.

Academic Significance and Societal Importance of the Research Achievements

環状シロキサン類に関する各国の詳細リスク評価から、特に水系への排出実態及び環境中濃度分布の把握が急務となっている。しかしながら、国内における環境データは非常に限られる状況にあり、本研究で得られた成果は、学術的にも新規性が高く、また、これら化学物質のリスク評価にも大いに貢献できるものと考えられる。
現在、欧州における環状シロキサンに関する化学物質管理体制の強化から、国際的にも、その用途や代替物質を含む環境への排出量が激変すると予想され、本研究で確立したGC/MSターゲット分析と全有機ケイ素の総量分析の組合せは，シロキサン類全体の環境内分布及び濃度推移を把握する上で強力なツールとなり得る。

Research Products

• [Int'l Joint Research] Wadsworth Center, NYS Dep Health(米国)
• [Journal Article] Development of a Method for Determination for Atmospheric Volatile Methylsiloxanes and Its Application to Environmental Monitoring (2018)
  • Author(s): 堀井勇一, 蓑毛康太郎, 大塚宜寿, 茂木守, 竹峰秀祐, 山下信義
  • Journal Title: BUNSEKI KAGAKU Volume: 67 Issue: 6 Pages: 313-322
  • DOI: 10.2116/bunsekikagaku.67.313
  • NAID: 130007393926
  • ISSN: 0525-1931
  • Year and Date: 2018-06-05
  • Peer Reviewed
• [Journal Article] Regional characteristics and annual and diurnal variations of methylsiloxanes in the atmospheric environment, Saitama, Japan (2018)
  • Author(s): Y. Horii, K. Minomo, N. Ohtsuka, M. Motegi, S. Takemine, M. Hara
  • Journal Title: Organohalogen Compounds Volume: 80 Pages: 385-388
  • Peer Reviewed
• [Journal Article] Regional characteristics and temporal trends of methylsiloxanes in the atmospheric environment, Saitama, Japan -Simultaneous analysis for 20 compounds- (2017)
  • Author(s): Y. Horii, K. Minomo, N. Ohtsuka, M. Motegi, K. Nojiri, S. Takemine, N. Yamashita
  • Journal Title: Organohalogen Compounds Volume: 79
  • Open Access
• [Journal Article] Distribution characteristics of volatile methylsiloxanes in Tokyo Bay watershed in Japan: Analysis of surface waters by purge and trap method (2017)
  • Author(s): Horii, Y., Minomo, K., Ohtsuka, N., Motegi, M., Nojiri, K., Kannan, K.
  • Journal Title: Science of the Total Environment Volume: 586 Pages: 56-65
  • DOI: 10.1016/j.scitotenv.2017.02.014
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Annual profiles of volatile methylsiloxanes in atmospheric environment in Saitama, Japan (2016)
  • Author(s): Horii, Y., Motegi, M., Minomo, K., Ohtsuka, N., Nojiri, K., Yamashita, N.
  • Journal Title: Organohalogen Compounds Volume: 78 Pages: 986-989
  • Open Access / Acknowledgement Compliant
• [Presentation] Emission and distribution of volatile methylsiloxanes in Tokyo Bay watershed of Japan (2019)
  • Author(s): Y. Horii, K. Minomo
  • Organizer: 2019 Pure and Applied Chemistry International Conference (PACCON 2019)
  • Int'l Joint Research / Invited
• [Presentation] 一般不燃ごみ処理におけるメチルシロキサン類の挙動 (2018)
  • Author(s): 堀井勇一、川嵜幹生
  • Organizer: 第27回環境化学討論会
• [Presentation] 大気中メチルシロキサン類の経時変化：通年及び日内大気モニタリングを例に (2018)
  • Author(s): 堀井勇一、蓑毛康太郎、 大塚宜寿、茂木守、 竹峰秀祐、原政之、野尻喜好
  • Organizer: 第27回環境化学討論会
• [Presentation] Regional characteristics and annual and diurnal variations of methylsiloxanes in the atmospheric environment, Saitama, Japan (2018)
  • Author(s): Y. Horii, K. Minomo, N. Ohtsuka, M. Motegi, S. Takemine, M. Hara
  • Organizer: 38th International Symposium on Halogenated Persistent Organic Pollutants
  • Int'l Joint Research
• [Presentation] 埼玉県における大気中メチルシロキサン類の濃度分布と地域特性 (2017)
  • Author(s): 堀井勇一、蓑毛康太郎、大塚宜寿、茂木守、竹峰秀祐、野尻喜好
  • Organizer: 第26回環境化学討論会
• [Presentation] Regional characteristics and temporal trends of methylsiloxanes in the atmospheric environment, Saitama, Japan -Simultaneous analysis for 20 compounds- (2017)
  • Author(s): Y. Horii, K. Minomo, N. Ohtsuka, M. Motegi, K. Nojiri, S. Takemine, N. Yamashita
  • Organizer: 37th International Symposium on Halogenated Persistent Organic Pollutants
  • Int'l Joint Research
• [Presentation] Distributions and risk assessment of cyclic volatile methylsiloxanes in surface water collected from Tokyo Bay watershed in Japan (2017)
  • Author(s): Y. Horii, K. Minomo, M. Motegi, N. Ohtsuka, S. Takemine
  • Organizer: 37th International Symposium on Halogenated Persistent Organic Pollutants
  • Int'l Joint Research
• [Presentation] GC/MSを用いるメチルシロキサン及び関連物質の一斉分析法の検討 (2017)
  • Author(s): 堀井勇一
  • Organizer: 第20回日本水環境学会シンポジウム
  • Int'l Joint Research
• [Presentation] 水環境中メチルシロキサン類の濃度分布とリスク評価 (2017)
  • Author(s): 堀井勇一、竹峰秀祐、蓑毛康太郎、大塚宜寿、茂木守
  • Organizer: 第20回日本水環境学会シンポジウム
• [Presentation] Environmental monitoring of cVMS in Japan (2017)
  • Author(s): Y. Horii
  • Organizer: 化学物質のPBT (Persistent, Bioaccumulative and Toxic)評価についての最新の研究動向に関するワークショップ
  • Invited
• [Presentation] Temporal trends of volatile methylsiloxanes in Tokyo Bay sediment core, Japan (2016)
  • Author(s): Horii, Y., Yamazaki, T., Lam, J., Yamashita, N.
  • Organizer: SETAC North America 37th Annual Meeting
  • Place of Presentation: Rosen Shingle Creek, Orlando, USA
  • Year and Date: 2016-11-07
  • Int'l Joint Research
• [Presentation] nnual profiles of volatile methylsiloxanes in atmospheric environment in Saitama, Japan (2016)
  • Author(s): Horii, Y., Motegi, M., Minomo, K., Ohtsuka, N., Nojiri, K., Yamashita, N.
  • Organizer: 36th International Symposium on Halogenated Persistent Organic Pollutants
  • Place of Presentation: Palazzo Dei Congressi, Frenze, Italy
  • Year and Date: 2016-08-29
  • Int'l Joint Research
• [Presentation] Occurrence of volatile methylsiloxanes in water, sediment, and fish samples collected from Tokyo Bay watershed (2016)
  • Author(s): Horii, Y.
  • Organizer: シリコーン工業会PBTワークショップ
  • Place of Presentation: ステーションコンファレンス東京
  • Year and Date: 2016-08-25
  • Invited
• [Book] The Handbook of Environmental Chemistry, Volatile Methylsiloxanes in the Environment (Chapter 2) (2019)
  • Author(s): Y. Horii, K. Kannan
  • Total Pages: 38
  • Publisher: Springer Nature Switzerland AG
• [Remarks] 埼玉県環境科学国際センター 研究員紹介 堀井勇一
  • URL: https://www.pref.saitama.lg.jp/cess/torikumi/kenkyuin-list/horii-yuichi.html
• [Remarks] 研究員紹介 堀井勇一
  • URL: https://www.pref.saitama.lg.jp/cess/torikumi/kenkyuin-list/horii-yuichi.html
• [Remarks] 化学物質担当の紹介-埼玉県環境科学国際センター
  • URL: https://www.pref.saitama.lg.jp/cess/torikumi/shokai/911-20091222-1366.html