Trace Elements Elements Trace elements in man Trace Elements in the earth The essentiality of trace elements Man is dependent on an ecosystem (the food chain) which provides him with trace elements. This ecosystem is the result of an equilibrium in constant movement. Trace elements are elements present at levels of under 1 mg/kg of body weight Trace elements in the human body in g/kg Iron ......................... 0.06 Fluorine ................... 0.037 Zinc ....................... ..0.033 Rubidium ................. 0.0046 Strontium ............... ..0.0046 Bromine .................. .0.0029 Copper .....................0.001 Vanadium ................ 0.0003 Selenium ................. 0.0002 Manganese ............. 0.0002 Iodine .......................0.0002 Molybdenum ............ 0.0001 Nickel ....................... 0.0001 Chromium ..................0.00002 Cobalt .................... ..0.00002 Uranium ................... 0.000001 Beryllium .................. 0.0000003