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1 引 言 不同价态的铬在环境中的分布、转化、迁移和生物效应都是不同的。不同价态微量铬的许多定量分离方法相继建立,但作为前处理的方法,往往会改变水环境的原始状态,从而引起水溶液中不同价态的铬的互相转化。而利用乳状液膜分离方法,既简便又快速;特别有利的是,在分离和富集过程中,保持了铬的原有价态,避免了Cr(Ⅲ)和Cr(Ⅵ)之间的互相转化。因此,我们在用乳状液膜富集分光光度法测定水中痕量Cr(Ⅵ)的工作基础上,用乳状液膜处理含铬的废水,使Cr(Ⅵ)富集到膜内水相中,而Cr(Ⅲ)留在料液中,然后分别进行测定。本文为环境中铬的价态分析提供了新的方法。
1 Introduction Different valences of chromium in the environment distribution, transformation, migration and biological effects are different. Many methods of quantitative separation of trace chromium in different valence states have been established one after another. However, as a pretreatment method, the original state of water environment is often changed, which leads to the conversion of different valences of chromium in aqueous solution. The use of emulsion liquid membrane separation method is both simple and fast; it is particularly advantageous that during the separation and enrichment, the original valence state of chromium is maintained and the mutual avoidance between Cr (III) and Cr (VI) Conversion. Therefore, based on the work of emulsion liquid membrane spectrophotometry for the determination of trace Cr (Ⅵ) in water, chromium (Cr) -containing wastewater was treated with emulsion liquid membrane to enrich Cr (Ⅵ) The Cr (Ⅲ) remain in the feed solution, and then were measured. This article provides a new method for the valence analysis of chromium in the environment.