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Total Plants: 103
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Plant Low PPM High PPM StdDev *Reference
Apium graveolens Pt 270.0 5035.0 USDA's Ag Handbook 8 and sequelae)
Brassica oleracea Stem 70.0 780.0 *
Allium cepa Bulb 230.0 2230.0 USDA's Ag Handbook 8 and sequelae)
*Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.