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硒的功与过硒(Se)是19世纪初瑞典科学家发现的一种人体必需的微量元素,在自然界中广泛分布。但硒刚被发现时它的名声并不好,甚至被视为剧毒物。瑞典科学家贝尔泽林发现硒元素后人们才知道,有些地区的环境中硒元素含量过高,可使牲畜、家禽以及人群发生硒中毒。马可·波罗的驮畜正是长期吃含硒丰富的牧草才中毒的。此外,当时医学界还怀疑它有致畸、致癌等毒性作用,因此在相当长的时间里,硒并没有引起人的重视。后来,人们发现,世界各地的畜群中广为流行的动物白肌病,是由于饲料中缺乏微量元素硒引起
Selenium power and selenium (Se) is a kind of trace element essential for human body discovered by Swedish scientists in the early nineteenth century and widely distributed in nature. But Se just discovered when its reputation is not good, and even regarded as highly toxic. After the Swedish scientist Belzerine discovered the selenium element, people did not realize that the selenium content in some areas was too high, which could cause selenosis in livestock, poultry and people. Marco Polo’s pack animals are poisoning long-term eating selenium-rich pastures. In addition, the medical profession was also suspected of teratogenicity, carcinogenic and other toxic effects, so for a long period of time, selenium did not attract the attention of people. Later, it was found that the prevalence of animal leukosis in livestock herds around the world was due to the lack of trace elemental selenium in the feed