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微量元素,是指机体内含量少于0.01％的元素物质,即人体内含量极少、每日需要量在100毫克以下的元素。按其在人体内的营养作用、生理功能等,可分为:①必需微量元素:多数学者认为有铁、锌、硒、铜、碘、铬、锰、钴、钼、镍、钒、硅、锡、氟等;②可能需要的微量元素有砷、溴、硼、锶等;③无毒微量元素有钡、钛、铌、锆等;④有害微量元素有铅、汞、铍、镉、铋、锑、铝等。金属微量元素不能在生物体内合成,而只能依靠饮食和环境接触摄入体内。各种微量元素的作用是互相联系又互相影响的,
Trace elements, refers to the body content of less than 0.01% of the elemental substances, that is, the human body content is very small, the daily requirement of 100 mg or less elements. According to their nutritional role in the human body, physiological functions, can be divided into: ① essential trace elements: Most scholars believe that iron, zinc, selenium, copper, iodine, chromium, manganese, cobalt, molybdenum, nickel, vanadium, silicon, Tin, fluorine, etc .; ② may need trace elements such as arsenic, bromine, boron, strontium; ③ non-toxic trace elements such as barium, titanium, niobium, zirconium, etc. ④ harmful trace elements lead, mercury, beryllium, cadmium, , Antimony, aluminum and so on. Metal trace elements can not be synthesized in the body, but can only rely on diet and environmental exposure to the body. The role of various trace elements are linked to each other and influence each other,