东湖水中硒的主要形态的分离和测定

Separation and Speciation of Selenium in the East Lake Water, Wuhan.

分别用0.45μm滤膜过滤、活性炭吸附和离子交换法,将水中痕量硒分为悬浮态和可溶态、胶态和非胶态、离子态和非离子态等主要形态,并将此形态分析方法用于东湖水中硒的实际测定。结果表明,东湖水中的硒主要以可溶离子态存在,约占水中总硒量的90％以上,其中又以Se(Ⅳ)为主要形体。

Trace selenium in natural water of the East Lake was separated into suspended particle and soluble, colloid and non-colloid, ionic and non-ionic species by means of 0.45μm filter membrane, activated carbon and anion exchange resin. Then the water samples were determined. The results showed that soluble ionic selenium was the dormant species, which amounted to about 70 per cent of total selenium in water, and four-valence selenium was prevailing.