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人体是由各种元素组成的,地球上所含的元素,人体内几乎都有。各种元素在人体内有多有少,有必需的,也有非必需的。在必需元素中,有些元素在体内只占人体总重量的万分之一以下,称为必需微量元素。现在被公认的必需微量元素有铁、铜、锌、钴、铬、硒、锰、氟、锶、镍、碘、钼、锡、钒等十四种。这些必需微量元素一旦缺乏,虽不会直接危害人的生命,但可引起人体生理功能及结构的异常,产生种种病理变化和疾病。所以,为了维护人体键康,应保证这些元素的足量供给。尤其在职业人群中,由于
The human body is composed of various elements, the elements contained on the earth, almost all within the human body. A variety of elements in the human body more or less, there is a need, there are non-essential. Among the necessary elements, some of the elements in the body account for only one ten thousandth of the total weight of the human body, called essential trace elements. Now recognized as the necessary trace elements are iron, copper, zinc, cobalt, chromium, selenium, manganese, fluorine, strontium, nickel, iodine, molybdenum, tin, vanadium and other 14 kinds. The lack of these essential trace elements, although not directly endanger human life, but can cause abnormalities in human physiological functions and structures, resulting in a variety of pathological changes and diseases. Therefore, in order to maintain human health, adequate supply of these elements should be guaranteed. Especially in the professional crowd, due