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本文对过去常用的甲基绿萃取法进行了改进。由于使用铈(Ⅳ)代替亚硝酸钠作氧化剂,降低了空白值,提高了灵敏度,并扩大了干扰元素铊、金的允许存在量,提高了方法的选择性,利用控制酸度,不经分离,可直接测定锑,简化了操作;大量的Ni、Co、Mn、Cr、Al、Zn、Sn、Cd等均不干扰测定,因而可以用于这些金属中锑的分析。用本法分析镉中锑的结果表明,其精密度与准确度均优于现行国家标准方法。
In this paper, methyl green extraction, which is commonly used in the past, was improved. As the use of cerium (Ⅳ) instead of sodium nitrite as oxidant, reducing the blank value and improve the sensitivity and expand the interfering elements thallium, gold allowed to exist and improve the selectivity of the method, the use of acidity control, without separation, The direct determination of antimony, simplifying the operation; a large number of Ni, Co, Mn, Cr, Al, Zn, Sn, Cd and so does not interfere with the determination, which can be used for the analysis of antimony in these metals. The analysis of antimony in cadmium by this method shows that the precision and accuracy of the method are superior to the current national standard methods.