In situ chemical analysis of natural water composition using laser ablated plasmas

• Project/Area Number: 25709084
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Naval and maritime engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Thornton Blair 東京大学, 生産技術研究所, 特任准教授 (60526789)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥24,960,000 (Direct Cost: ¥19,200,000、Indirect Cost: ¥5,760,000); Fiscal Year 2015: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000); Fiscal Year 2014: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000); Fiscal Year 2013: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
• Keywords: レーザー誘起破壊分光 / 自然水 / 化学分析 / 分光分析 / LIBS / 海 / 海水 / 熱水 / 海水他元素分析 / プラズマ発光 / レーザ / レーザ誘起破壊分光法 / 液体の化学分析 / 元素分析 / プラズマ / 海洋調査 / 資源調査 / 環境調査

Outline of Final Research Achievements

The aim of this research is to develop a technique for in situ, multi-element analysis of natural river, lake and oceanic fluids. The method developed is based on laser-induced breakdown spectroscopy. In this technique, a high power laser pulse of focused into a bulk fluid to generate a plasma. By observing the spectrum of light emitted from the plasma, it is possible to perform realtime element analysis of ionic species dissolved in seawater. In this research, we demonstrated that the technique can be applied to the high-pressure high-temperature environments that exist on the seafloor. Furthermore, we demonstrated that by measuring the shot-to-shot energy of the laser pulse used and monitoring the temporal evolution of each plasma that is generated, it is possible to significantly improve the quantitative performance of the developed method.

Research Products

• [Journal Article] A calibration-free approach for on-site multi-element analysis of metal ions in aqueous solutions by electrodeposition-assisted underwater laser-induced breakdown spectroscopy (2016)
  • Author(s): Ayumu Matsumoto, Ayaka Tamura, Ryo Koda, Kazuhiro Fukami, Yukio H. Ogata, Naoya Nishi, Blair Thornton, Tetsuo Sakka
  • Journal Title: Spectrochimica Acta Part B: Atomic Spectroscopy Volume: 118 Pages: 45-55
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] On site Quantitative Elemental Analysis of Metal Ions in Aqueous Solutions by Laser-Induced Breakdown Spectroscopy Combined with Electrodeposition under Controlled Potential (2015)
  • Author(s): Ayumu Matsumoto, Ayaka Tamura, Ryo Koda, Kazuhiro Fukami, Yukio Ogata, Naoya Nishi, Blair Thornton, Tetsuo Sakka
  • Journal Title: Analytical Chemistry Volume: 87 Pages: 1655-1661
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of a deep-sea Laser-induced breakdown spectrometer for in situ multi-element chemical analysis (2015)
  • Author(s): Thornton, B., Takahashi, T., Sato, T., Sakka, T., Tamura, A., Matsumoto, A., Nozaki, T., Ohki, T. and Ohki, K.
  • Journal Title: Deep-Sea Research Part I Volume: 95 Pages: 20-36
  • DOI: 10.1016/j.dsr.2014.10.006
  • Peer Reviewed / Open Access
• [Journal Article] Long-Duration Nanosecond Single Pulse Lasers for Observation of Spectra from Bulk Liquids at High Hydrostatic Pressures (2014)
  • Author(s): Blair Thornton, Tetsuo Sakka, Tatsuya Masamura, Ayaka Tamura, Tomoko Takahashi, Ayumu Matsumoto
  • Journal Title: Spectrochimica Acta Part B Volume: TBD
  • Peer Reviewed
• [Presentation] Deep-Sea Laser-Induced Breakdown Spectroscopy and its Application to Hydrothermal Mineral Surveys in the Okinawa Trough (2016)
  • Author(s): Blair Thornton, Tomoko Takahashi, Takumi Sato, Tetsuo Sakka, Toshihiko Ohki, Koichi Ohki
  • Organizer: In Proc. Ocean Sciences Meeting 2016
  • Place of Presentation: New Orleans, US
  • Year and Date: 2016-02-23
• [Presentation] Application of Laser-Induced Breakdown Spectroscopy for In-situ Measurement of Metal Grade for Seafloor Mineral Processing (2015)
  • Author(s): Yasuharu Nakajima, Blair Thornton, Takumi Sato
  • Organizer: In Proc. Oceans 2015
  • Place of Presentation: Washington, US
  • Year and Date: 2015-10-19
• [Presentation] Quantitative Elemental Analysis of Trace Metal Ions in Aqueous Solutions by Underwater LIBS Combined with Pre-concentration by Electrodeposition (2015)
  • Author(s): Tetsuo Sakka, Ayumu Matsumoto, Ayaka Tamura, Ryo Koda, Kazuhiro Fukami, Yukio H. Ogata, Naoya Nishi, Blair Thornton
  • Organizer: ASLIBS 2015, China
  • Place of Presentation: Wuhan, China
  • Year and Date: 2015-06-24
• [Presentation] Towards real-time quantification of seawater composition using laser-induced breakdown spectroscopy’ (2015)
  • Author(s): Takumi Sato, Blair Thornton, Tomoko Takahashi, Tetsuo Sakka, Toshihiko Ohki, Koichi Ohki
  • Organizer: In Proc. Oceans 2015
  • Place of Presentation: Genoa, Italy
  • Year and Date: 2015-05-18
• [Remarks] Ocean Perception Laboratory
• [Remarks] 研究室ホームページ
• [Remarks] 深海底レーザ誘起破壊分光法に関する研究
  • URL: http://ocean.iis.u-tokyo.ac.jp/ja/research/laser_induced.html
• [Patent(Industrial Property Rights)] Chemical analysis device (2016)
  • Inventor(s): Thornton, Sakka, Ohki
  • Industrial Property Rights Holder: Thornton, Sakka, Ohki
  • Industrial Property Rights Type: 特許
  • Filing Date: 2016-02-23
  • Acquisition Date: 2016-04-18
  • Overseas