微量元素是指在人体内含量极少,只占人体重量的万分之一以下,但每天又需要或补充的量及小于100毫克的元素。这样的元素又称必需元素。现已知的这种元素有14种,它们是铁、锌、铜、碘、硒、氟、钼、锰、铬、镍、钒、锡、硅、钴等。 Trace elements in the human body content is very small, accounting for only one ten thousandths of human body weight, but the amount of daily needs or additional and less than 100 mg of elements. Such elements are also called required elements. There are 14 kinds of this kind of known elements, they are iron, zinc, copper, iodine, selenium, fluorine, molybdenum, manganese, chromium, nickel, vanadium, tin, silicon, cobalt and so on.