摘要: Human health has in the past and continues to be influenced by amounts proportions of chemical elements which human beings are exposed through food, drinking water atmosphere. Direct ingestion inhalation soil dust also sometimes important. Some these nutritionally essential, others may toxic. Most essential toxic if present large amounts. Trace metals considered this article. Their essentiality toxicity been reviewed Underwood (1977), Crounse et al. (1983), Moynahan (1979) many other authors. They list cobalt (Co), chromium (Cr), copper (Cu), fluorine (F), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), zinc (Zn) as essential; nickel (Ni), tin (Sn), silicon (Si), vanadium (V) possibly aluminium (Al), arsenic (As), cadmium (Cd), lead (Pb), mercury (Hg)