Abstract：A determination method of metallic aluminum by CyDTA titration was proposed after sample dissolution by ferric trichloride and separation by strong alkali. The sample was dissolved with ferric trichloride solution. Then, the metallic aluminum was separated from aluminum oxide in the solution at pH 12. The metallic aluminum was transferred into solution in the form of ions. After adding sodium hydroxide solution, metallic aluminum was dissolved, while the interference elements such as iron and manganese were precipitated. Aluminum was complexed with CyDTA in the solution at pH 56. At room temperature, the excessive CyDTA was back titrated with lead nitrate using xylenol orange as indicator. The effect of sample size, concentration and dosage of ferric trichloride, stirring time, complex agent and indicator on determination was investigated. The optimal experimental conditions were as follows: the concentration and dosage of ferric trichloride were 80 g/L and 50 mL, and the stirring time was 60 min. The proposed method was applied to the determination of metallic aluminum in refining slag modifier. The relative standard deviation (RSD) was less than 3 %. The determination results were consistent with those obtained by EDTA titration method.
陶俊. CyDTA滴定法测定精炼调渣剂中金属铝[J]. 冶金分析, 2012, 32(3): 55-58.
TAO Jun . Determination of metallic aluminum in refining slag modifier by CyDTA titration. , 2012, 32(3): 55-58.
