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硒元素发现于1817年,早期被认为是极为有害的元素,1957年发现少量的硒对防治活动物肝坏死是必要的,1973年联合国卫生组宣布,硒是人体生命必须的微量元素,缺乏时健康遭受损害;目前已知缺硒遍及世界四十多个国家和地区;在中国有二十二个省市的部分或大部分地区缺硒,高硒仅见于湖北恩施,1980年发现了第二个高硒区——陕西省紫阳县。紫阳县是中国的一个古老的茶区,誉满西北的名茶“陕青茶”主要指紫阳茶。1980—1986年在调查紫阳富硒的成土母质→土壤→动植物的工作中,对茶叶含硒量进行了分析,现小结如下:
Selenium was found in 1817, was considered an extremely harmful element in early 1957 found that a small amount of selenium is necessary to prevent liver necrosis in animals, the United Nations Health Group announced in 1973, selenium is a trace element essential to human life, lack of time Health damage suffered; currently known lack of selenium throughout the world more than 40 countries and regions; in some 22 provinces and cities in China in most or part of the lack of selenium, high selenium only found in Enshi, Hubei Province, found in 1980 second A high-selenium area - Ziyang County, Shaanxi Province. Ziyang County is an ancient tea plantation in China. Famous tea “Shaanqing Tea” in the northwest is mainly referred to as Ziyang Tea. 1980-1986 in the investigation Ziyang selenium enrichment of soil parent material → soil → plant and animal work, the analysis of the selenium content of tea, are summarized as follows: