Two New Reference Materials Based on Tobacco Leaves: Certification for over a Dozen of Toxic and Essential Elements

<table>Particle size distribution of the candidate reference materials: Oriental Basma Tobacco Leaves (INCT-OBTL-5) and Polish Virginia Tobacco Leaves (INCT-PVTL-6).</table>

The Scientific World Journal

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Figure 2

Figure 2: Two New Reference Materials Based on Tobacco Leaves: Certification for over a Dozen of Toxic and Essential Elements 