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New Technique for the Direct Analysis of Food Powders Confined in a Small Hole Using Transversely Excited Atmospheric CO2 Laser-Induced Gas Plasma

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Abstract:

Taking advantage of the differences between the interactions of transversely excited atmospheric (TEA) CO2 lasers with metal and with organic powder, a new technique for the direct analysis of food powder samples has been developed. In this technique, the powder samples were placed into a small hole with a diameter of 2 mm and a depth of 3 mm and covered by a metal mesh. The TEA CO2 laser (1500 mJ, 200 ns) was focused on the powder sample surfaces, passing through the metal mesh, at atmospheric pressure in nitrogen gas. It is hypothesized that the small hole functions to confine the powder particles and suppresses the blowing-off of sample, while the metal mesh works as the source of electrons to initiate the strong gas breakdown plasma. The confined powder particles are then ablated by laser irradiation and the ablated particles move into the strong gas breakdown plasma region to be atomized and excited; this method cannot be applied for the case of Nd:YAG lasers because in such case the metal mesh itself was ablated by the laser irradiation. A quantitative analysis of a milk powder sample containing different concentrations of Ca was successfully demonstrated, resulting in a good linear calibration curve with high precision.

Keywords: DIRECT ANALYSIS; LASER-INDUCED BREAKDOWN SPECTROSCOPY; LIBS; METAL MESH-INDUCED LASER PLASMA; POWDER SAMPLES; TEA CO2 LASER; TRANSVERSELY EXCITED ATMOSPHERIC CO2 LASER

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370208786822151

Affiliations: 1: Department of Physics, Faculty of Education and Regional Studies, University of Fukui, Fukui 910-8507, Japan 2: Department of Chemistry, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Banda Aceh, Nanggroe Aceh Darussalam, 23111, Indonesia 3: Department of Community Nursing, Faculty of Medical Sciences, University of Fukui, Japan 4: Department of Physics, Research Institute of Physics and Chemistry, Chonbuk National University, Chonju 561-756, Republic of Korea 5: Department of Physics, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Banda Aceh, Nanggroe Aceh Darussalam, 23111, Indonesia 6: Research Center of Maju Makmur Mandiri Foundation, 40 Srengseng Raya, Kembangan, Jakarta Barat 11630, Indonesia

Publication date: December 1, 2008

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