2001 Fiscal Year Final Research Report Summary
Production of High-Power Microwave-Induced Helium Plasma at Atmospheric Pressure for Trace Element Analysis
| Project/Area Number |
11680491
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
プラズマ理工学
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| Research Institution | Toyo University |
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Principal Investigator |
OKAMOTO Yukio Faculty of Eng., Toyo University, Professor, 工学部, 教授 (90233387)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Trace element analysis / Microwave-induced helium plasma / Okamoto cavity / Atomic emission spectrometry / Mass spectrometry / Surface-wave mode plasma / Inductively-coupled plasma |
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| Research Abstract |
A high-power (〜1 kW, 2.45 GHz) annular-shaped microwave-induced helium plasma at atmospheric pressure was developed for determination of nonmetals in the aqueous solutions. The plasma was generated by an Okamoto cavity (Y. Okamoto, Anal. Sci. 7 (1991) 283) which was modified to focus the energy and low gas flow rate )101/min). No external cooling was used to stabilized the plasma. An aqueous solution was injected into the plasma by an ultrasonic system with desolvation and condensation. The electron density and iron excitation temperature were on the order of 10^<14>cm3 and 5000 K, respectively. Introduction of aqueous fluoride in the form of NaF, chloride in the form of NaCl, and bromide in the form of KBr produced intense emission and detection limits of 100 ppb for FI(685.6 nm), 100 ppb for Cl II(479.5 nm), and 200 ppb for Br II(470.5 nm) were obtained.
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