火焰原子吸收光谱法测定锰铁炉渣中微、痕量钴

Determination of Micro and Trace Cobalt in Ferromanganese Slag by Flame Atomic Absorption Spectrometry

摘要: 通过对锰铁炉渣的化学组成和性质的研究，确定了以火焰原子吸收光谱法测定钴的实验方法。通过研究，找出了样品分解方法、最佳测定介质和酸度、共存离子的干扰情况等。样品分解过程中加入氢氟酸与二氧化硅生成四氟化硅，经高氯酸冒烟除去，即可达到完全分解，同时消除硅的干扰。锰、钙、镁、铝等含量较高的基体对钴的测定没有干扰。实验表明，方法的检出限为0.0078 mg/L，相对标准偏差处于0.34%~2.14%之间，回收率在97.8%~101.4%范围内，满足分析要求。该方法已成功应用于锰铁炉渣中钴的分析，并正在申报行业标准。

Abstract: Through the research of the chemical composition and nature of ferromanganese slag, the method of cobalt by the flame atomic absorption spectrometry was determined. Through the research, we found out the sample decomposition method, the best optimal medium and acidity, the interference of coexisting ions, etc. In the process of decomposition, sample was decomposed completely by adding hydrofluoric acid to reaction with silicon to generate SiF4 which was removed by perchloric acid smoking, so the interference of silicon on the determination of cobalt was eliminated completely. Calcium, magnesium and aluminum didn’t affect the determination of cobalt. Experi-mental results showed that the detection limit was 0.0078 mg/L, the relative standard deviation was between 0.34%~2.14%, the recovery rate was in the range of 97.8%~101.4%, and the analysis results was good. Successfully, the method has been applied in the analysis of cobalt in ferro-manganese slag, and is to declare the industry standard.