Characteristics of a High-Power Microwave-Induced Helium Plasma at Atmospheric Pressure for the Determination of Nonmetals in Aqueous Solution

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Abstract:

A high-power [~1000 W continuous wave (CW), 2.45 GHz] annular-shaped microwave-induced helium plasma (He-MIP) was developed for the determination of nonmetals in aqueous solutions, and the characteristics are presented. The plasma was generated at atmospheric pressure by an Okamoto cavity that was modified to focus the energy. No external cooling was used to stabilize 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 1014/cm3 and 5000 K, respectively. Introduction of aqueous chloride in the form of NaCl and bromide in the form of KBr produced intense ion emission, and detection limits of 100 ppb for Cl(II) (479.5 nm) and 200 ppb for Br(II) (470.5 nm) were obtained.

Keywords: AQUEOUS; ATMOSPHERIC-PRESSURE; CAVITY; DETECTION; EMISSION; HELIUM; MICROWAVE-INDUCED; NONMETAL; OKAMOTO; PLASMA; SOLUTION; SPECTROMETRY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011951623

Affiliations: 1: Department of Electrical and Electronic Engineering, Faculty of Engineering, Toyo University, Kawagoe, Saitama 350-8585, Japan 2: Department of Electrical and Electronic Engineering, Faculty of Engineering, Toyo University, Kawagoe, Saitama 350-8585, Japan; and Bio-Nano Electronics Research Center, Toyo University, Kawagoe, Saitama 350-8585, Japan

Publication date: February 1, 2001

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