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人们发现,火焰原子吸收法测定钨只限于分析地球化学样品,因为原子吸收法测定钨的灵敏度差,但对其他元素的干扰却很敏感。Musil和Dole(?)al为此提出了一种可用来测定铁合金中钨的原子吸收法:用硫氰酸盐和甲基·异丁基酮从较浓的盐酸介质中进行双重萃取。N-苯甲酰苯基羟胺(BPHA)作为金属离子的萃取剂,其优点已得到充分证实,已有若干篇关于在合适条件下用这种试剂定量萃取钨的报告。本研究旨在发展利用BPHA-甲苯的萃取体系原子吸收法和有机相中的火焰原子吸收法测量岩矿中低含量的钨。
It has been found that flame atomic absorption spectrometry for the determination of tungsten is limited to the analysis of geochemical samples because of the poor sensitivity of atomic absorption spectrometry to tungsten but sensitive to the interference of other elements. For this reason, Musil and Dole (?) Al proposed an atomic absorption method that can be used to determine tungsten in ferrous alloys: double extraction from concentrated hydrochloric acid with thiocyanate and methyl isobutyl ketone. The advantages of N-benzoylphenylhydroxylamine (BPHA) as an extractant for metal ions have been well documented and there are several reports on the quantitative extraction of tungsten with this reagent under suitable conditions. The purpose of this study was to develop a method for the determination of low levels of tungsten in rock ores by flame atomic absorption spectrometry using the extraction system of BPHA-toluene and atomic absorption spectrometry in the organic phase.