Application of laser-induced breakdown spectrometry for direct determination of trace elements in starch-based flours
Cho, Hyo-Hyun; Kim, Young-Ju; Jo, Young-Soo; Kitagawa, Kuniyuki; Arai, Norio; Lee, Yong-Ill; Cho Hyo-Hyun; Department of Chemistry, College of Natural Sciences, Changwon National University; Kim Young-Ju; Department of Chemistry, College of Natural Sciences, Changwon National University; Jo Young-Soo; Department of Chemistry, College of Natural Sciences, Changwon National University; Kitagawa Kuniyuki; Research Center for Advanced Energy Conversion, Nagoya University; Arai Norio; Research Center for Advanced Energy Conversion, Nagoya University; Lee Yong-Ill; Department of Chemistry, College of Natural Sciences, Changwon National University
Журнал:
Journal of Analytical Atomic Spectrometry
Дата:
2001
Аннотация:
Spatially resolved laser-induced breakdown spectrometry (LIBS) was investigated to evaluate the feasibility as a quick and simple method to analyze trace elemental concentrations in starch-based flour samples. A Ndâ ¶YAG laser beam (λâ =â 1064â nm, 30â mJâ pulse<sup>â 1</sup>) has been used for generation of laser-induced plasma on sample surface under reduced pressure of argon atmosphere. A series of starch powder samples containing different concentrations of Sr, Mg, Al, Cu, Cr, K, Mn, Rb, Cd, and Pb were used to construct the calibration curves and estimate detection limits of measurements. The calibration graphs for all elements show good linearity (correlation coefficient, râ >â 0.99) in the range 0â 160â µgâ g<sup>â 1</sup> or within three orders of magnitude. Detection limits achieved were below 18â µgâ g<sup>â 1</sup> for all elements studied in this work. The lowest detection limit (0.3â µgâ g<sup>â 1</sup>) was obtained from Sr measurement. Precision (%RSD) for the selected analysis was in the range 2â 10%. The standard addition method was applied to assess the accuracy of LIBS using a NIES standard rice sample. The concentrations of Mg and Mn in NIES standard rice sample determined by spatially resolved LIBS technique have good agreements with those of certified value within an error range. The results indicate that spatially resolved LIBS has been shown to be an accurate technique for determining trace elements of ppm (µgâ g<sup>â 1</sup>) level in starch-based food samples directly with an acceptable precision without any tedious digestion and dilution procedure.
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