Elemental analysis of a series of dried, powdered, kelp food supplements for heavy metals via energy dispersive X-ray fluorescence

Garshott, Danielle, Elizabeth MacDonald, Meghann Mouyianis, Elizabeth Roberts-Kirchhoff, and Mark A. Benvenuto

Seventeen kelp dietary supplements, all of which were purchased at health food or drug stores, have been analyzed by energy dispersive X-ray fluorescence (EDXRF) spectroscopy.  The supplements were examined for the presence of arsenic, lead, and mercury.  Before analysis of the sample set, a series of standards for was created, because there appear to be no established, NIST standards for such food supplements.  The findings for these items are presented and discussed, as is the method for heavy metal standards production.