Data Views Exclude Ubiquitous Chemicals Activities: 348 Chemicals w/Activities: 37 All Chemicals: 61 CSV Excel PDF Show All Paginate Previous1234 Click on column headings to sort the list on the column # Activity Chemical Part All parts ... Leaf Plant Root Low PPM High PPM StdDev *Reference 77 77 ZINC Root 15.0 51.0 1.17 * *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.