Direct analysis of powder samples using transversely excited atmospheric CO2 laser-induced gas plasma at 1 atm |
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| Authors: | Ali Khumaeni Zener Sukra Lie Hideaki Niki Koo Hendrik Kurniawan Efendy Tjoeng Yong Inn Lee Kazuyoshi Kurihara Yoji Deguchi Kiichiro Kagawa |
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| Affiliation: | (1) Program of Nuclear Power and Energy Safety Engineering, Graduate School of Engineering, University of Fukui, Fukui 910–8507, Japan;(2) Maju Makmur Mandiri Research Center, Kembangan, Jakarta, 11630, Indonesia;(3) PT Agarindo Bogatama, Jl. Jelambar Selatan II/4, Jakarta, 11460, Indonesia;(4) Department of Physics, Research Institute of Physics and Chemistry, Chonbuk National University, Chonju, 561–756, South Korea;(5) Department of Physics, Faculty of Education and Regional Studies, University of Fukui, Fukui 910–8507, Japan;(6) Department of Community Nursing, Faculty of Medical Sciences, University of Fukui, Fukui, Japan;(7) Research Institute of Nuclear Engineering, University of Fukui, Bunkyo 3-9-1, Fukui 910-0017, Japan; |
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| Abstract: | A novel method for the direct and sensitive analysis of powder samples has been developed by utilizing the characteristics of a transversely excited atmospheric (TEA) CO2 laser. In this study, a powder sample was placed in a container and covered by a metal mesh; the metal mesh functions to control the blowing-off of the powder. The container was then perpendicularly attached on a metal surface. When a TEA CO2 laser (1.5 J, 200 ns) was focused on the metal surface, a large hemispherical gas plasma (radius of around 8 mm) with long emission lifetime (several tens of microseconds) was produced without ablating the metal surface. The high-speed expansion force of the gas plasma samples the powder covered by the metal mesh and fine powder particles are sent into the gas plasma region to be dissociated and excited. Sensitive semi-quantitative analysis was made on organic powder samples such as powdered rice, starch, seaweed (agar), and supplements. The detection limit of heavy metals of Cr in powdered mineral supplement was approximately 0.55 mg/kg. |
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