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

<table>Changes of the overall mean and its standard deviation for As in INCT-PVTL-6 observed while executing the outlier’s rejection procedure.</table>

The Scientific World Journal

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Figure 4

Figure 4: Two New Reference Materials Based on Tobacco Leaves: Certification for over a Dozen of Toxic and Essential Elements 