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Background and purpose: Cereals are the most important components of a healthy diet. Rice is one of the most common consumed grains in the world and a staple food of people in everyday meals. This study aimed at introducing a novel analytical approach in investigation of harmful metals and necessary elements in some types of Iranian rice by using Laser Induced Breakdown Spectroscopy (LIBS) method. Materials and methods: Six types of consumed rice produced in different parts of the country have been collected from the market in 2013. All types of rice have been analyzed for seven times using LIBSCAN100 system and then spectra recorded have been analyzed by Plasus Specieline software. Results: In this study, necessary elements and harmful metals have been analyzed in all samples. The average concentrations of zinc, phosphorus, iron, potassium, calcium, fluorine, chromium (III), and magnesium were 93.660mg/kg, 87.666mg/kg, 348mg/kg, 379.166mg/kg, 343.666mg/kg, 22mg/kg, 24.848mg/kg 1071.833mg/kg, respectively. This average content for harmful metals were 6.095mg/kg for lead, 0.773mg/kg for mercury, 0.963mg/kg for nickel, 2.391mg/kg for chromium (VI), and 0.940mg/kg for arsenic. No samples were found with cadmium. Conclusion: The results indicate that, the concentration of magnesium was higher in necessary elements and that Isfahan Lenjan rice contained higher content of necessary elements. Chromium (VI) was the most common harmful metal among all samples. Furthermore, the local Tarom rice was found to be the safest in all samples. Laser Induced Breakdown Spectroscopy technique could be used as a fast, nondestructive, multi elemental analyzer that does not need initial preparation.

Keywords: Iranian rice, Laser Induced Breakdown Spectroscopy, necessary elements, harmful metals

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