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硒的重要的生物学效应及地球化学特征均与它的存在价态密切相关,因此分别测定环境样品中不同价态的硒十分必要。水体中的硒主要以四、六价离子态(SeO_3~(2-)、HSeO_3~-、SeO_4~(2-))存在,由于某些还原作用也可能生成单体硒和甲基硒化物。近年来,相继报导有萤光光度、气相色谱、火焰和石墨管原子吸收等方法,分别测定水中痕量的硒(Ⅳ)和总硒。我们在Cutter工作的基础上,研究了单体硒、硒(Ⅳ)和硒(Ⅵ)生成氢化物的能力、
The important biological and geochemical characteristics of selenium are closely related to the valence of its existence, so it is necessary to determine the selenium in different valence states in the environmental samples. Selenium in water mainly exists in four or six-valent ionic states (SeO_3 ~ (2 -), HSeO_3 ~ -, SeO_4 ~ (2-)), and some selenium and methyl selenide may also be formed due to some reduction. In recent years, fluorescence, gas chromatography, flame and graphite tube atomic absorption have been reported in succession, respectively, trace levels of selenium (Ⅳ) and total selenium in water. Based on the work of Cutter, we studied the ability of monomeric selenium, selenium (Ⅳ) and selenium (Ⅵ) to form hydride,