化学元素是人体构成的基本要素 ,并在人体生命过程中起着重要作用。人体的化学元素分为宏量元素与微量元素 ,宏量元素占人体总重量 99.95 % ,微量元素只占 0 .0 1%。微量元素硒在人体内的含量为 6 12mg[1] 。1973年联合国世界卫生组织确认 ,硒是机体不可缺少的一种微量元素。 1 Chemical elements are the basic elements of the human body and play an important role in human life. The body’s chemical elements are divided into macro elements and trace elements, macro elements of the total body weight of 99.95%, trace elements only 0.01%. Trace elements selenium in the human body content of 6 12mg [1]. The United Nations World Health Organization in 1973 confirmed that selenium is an essential trace element of the body. 1