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近年来发展的化学富集与微量取样技术相结合的原子吸收测定方法,不仅提高了火焰原子吸收的相对灵敏度,还可方便地进行连续测定。本文在前工作的基础上,将待测金属离子以吡咯烷二硫代甲酸氨(APDC)络合物的形式萃取入甲基异丁基酮(MIBK)中,用微量取样技术进样,从1毫升有机相中测定了镉和钴。由于APDC能与许多重金属形成络合物,又不与稀土元素起作用,因此这种方法已经发展成为从少量稀土样品中测定多种痕量非稀土杂质的通用的有效方法。
In recent years, the combination of chemical enrichment and trace sampling techniques of atomic absorption spectrometry, not only increased the relative sensitivity of flame atomic absorption, but also can be easily continuous measurement. Based on the previous work, the metal ions to be detected were extracted into methyl isobutyl ketone (MIBK) in the form of complex of pyrrolidine dithiocarbamate (APDC) and injected by micro-sampling technique. From Cadmium and cobalt were measured in 1 mL of organic phase. Since APDC forms complexes with many heavy metals and does not interact with rare earth elements, this approach has evolved to be a versatile and efficient method for determining trace amounts of trace non-rare earth impurities from a small number of rare earth samples.