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随着碲在工业上的广泛应用和对环境的污染,人们对它的生物学效应、地球化学特征以及与存在状态、价态的关系日趋关心。因此,环境样品中痕量的不同价态碲的分别测定,已为分析化学工作者所重视。其中氢化法原子吸收和无焰原子吸收法报导较多[1—9]。 我们在用巯基棉纤维富集多种微量元素[10—12]、分离有机汞与无机汞[13]、砷(Ⅲ)与砷(Ⅴ)[14]、锑(Ⅲ)与锑(Ⅴ)[15]、硒(Ⅳ)与硒(Ⅵ)(16)的基础上,提出利用巯基棉对碲(Ⅳ)和碲(Ⅵ)截然不同的吸附性能加以分离富集,然后用氢化法原子吸收分别测定的新方法。 本法与文献报导的数种方法相比,富集倍数大、测定灵敏度高、分离简便、选择性强,且有效地消除了多种共存元素干扰,可直接准确测定环境水样中痕量的碲(Ⅳ)和碲(Ⅵ)。
With the widespread application of tellurium in the industry and its pollution to the environment, people are increasingly concerned about its biological effects, geochemical characteristics, and its relationship with existing states and valence states. Therefore, the determination of trace amounts of different valence tellurium in environmental samples has been taken seriously by analytical chemists. Hydrogenation atomic absorption and flameless atomic absorption method reported more [1-9]. We are using thiol cotton fiber to enrich trace elements [10-12], separating organic mercury from inorganic mercury [13], arsenic (Ⅲ) and arsenic (Ⅴ) [14], antimony (Ⅲ) and antimony (Ⅳ) and tellurium (Ⅵ) based on selenium (Ⅳ) and selenium (Ⅵ) (16), the adsorption and desorption of tellurium (Ⅳ) and tellurium The new method was determined separately. Compared with several methods reported in the literature, the method has the advantages of large enrichment multiple, high sensitivity, simple and selective separation, and effectively eliminating the interference of multiple coexisting elements, and can directly and accurately determine trace amounts of Tellurium (Ⅳ) and tellurium (Ⅵ).