Data Views Exclude Ubiquitous Chemicals Activities: 452 Chemicals w/Activities: 47 All Chemicals: 81 CSV Excel PDF Previous12345 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Bark Flower Leaf Plant Seed Stem Stem Bark Low PPM High PPM StdDev *Reference 0 ZIRCONIUM Leaf 0.6 6.7 -0.5 * *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.