Nanoparticulate metal sulfides and their importance of stability of trace metals in oxygenated seawater

• Project/Area Number: 15K00516
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Osaka University (2016-2017); The University of Tokyo (2015)
• Principal Investigator: Nakayama Noriko 大阪大学, 理学研究科, 招へい研究員 (60431772)
• Research Collaborator: OBATA Hajime ; NISHIOKA Jun
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 金属硫化物 / ナノ粒子態 / 海水中の微量金属 / 海底熱水 / 海水中の金属硫化物 / ナノ粒子 / ナノサイズ分画法 / ナノ粒子態金属硫化物 / 熱水

Outline of Final Research Achievements

Concentrations of acid volatile sulfides (AVS) as metal sulfides were studied over the submarine hydrothermal fields with an emphasis on the stability and preservation of trace metal. These studies find several important aspects of metal sulfide nanoparticles. Dissolved metal sulfide originating from hydrothermal vents contributes to a large portion of the observed high dissolved total sulfide concentration even in the surface water, indicating that metal-sulfide complex is quite stable in preventing its rapid removal from the water column by metal precipitation and/or oxidation in an oxic environment.

Research Products

• [Journal Article] Size fractionation of nanoparticulate metal sulfides in oxic water of Lake Teganuma, Japan (2016)
  • Author(s): Nakayama, N., T. Tokieda, A. Suzuki, T. Kim, T. Gamo and H. Obata
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 50 Issue: 3 Pages: 281-286
  • DOI: 10.2343/geochemj.2.0408
  • NAID: 130005153280
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Sulfides in oxic seawater over the submarine hydrothermal area of Kikai Caldera south of Kyushu Island, Japan (2015)
  • Author(s): Nakayama, N., K. Shirai, Y. Sano, T. Gamo and H. Obata
  • Journal Title: Geochemical Journal Volume: 49 Pages: 1-7
  • NAID: 130005092564
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Nanoparticulate metal sulfides over the hydrothermal area in Okinawa Trough: Size distribution and its variation (2017)
  • Author(s): Nakayama N., T. Gamo and H. Obata
  • Organizer: East Asia GEOTRACES Workshop
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2017-01-16
  • Int'l Joint Research
• [Presentation] Nanometer size fractionation of metal sulfides over the hydrothermal area in Okinawa Trough (2016)
  • Author(s): Nakayama N., T. Gamo and H. Obata
  • Organizer: 26th Goldschmidt Conference
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] 湖沼におけるナノ粒子態酸揮発性硫化物 (2015)
  • Author(s): 中山典子，時枝隆之，加西眞由子，鈴木麻彩実，金泰辰、蒲生俊敬，小畑元
  • Organizer: 日本地球化学会年会
  • Place of Presentation: 横浜国立大学常盤台キャンパス(神奈川県横浜市)
  • Year and Date: 2015-09-16
• [Presentation] Sulfides in oxic seawater over the submarine hydrothermal area of Kikai Caldera south of Kyushu Island, Japan (2015)
  • Author(s): Nakayama, N., K. Shirai, Y. Sano, T. Gamo and H. Obata
  • Organizer: Goldschmidt Conference, 25th Anniversary
  • Place of Presentation: Prague, CZ
  • Year and Date: 2015-08-17
  • Int'l Joint Research