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. Author manuscript; available in PMC: 2021 Mar 19.
Published in final edited form as: Int J Environ Anal Chem. 2015 Dec 21;96(1):15–37. doi: 10.1080/03067319.2015.1114104

Figure 3.

Figure 3.

Difference plots (XRF – ICP-OES value) for Pb, As, and Hg in powdered samples measured with the XOS prototype and the Niton; left side shows all results, right includes only low mg/kg range; XRF(n=3, error bars +/− SD), dashed lines indicate +/− 50% of reference value; HMP (herbal medicine product), ES (ethnic spice), CP (cosmetic product)