铝铁合金中铁和铝的联合测定法  

Combined Determination of Aluminum and Iron in Ferroaluminum

作　　者：崔晓翠 CUI Xiaocui(Shandong Institute of Metallurgical Science Co.,Ltd.,Jinan 250102,China)

机构地区：[1]山东省冶金科学研究院有限公司,山东济南250102

出　　处：《山东冶金》2024年第5期39-41,共3页Shandong Metallurgy

摘　　要：研究了一种联合测定铝铁合金中Al和Fe的分析方法。试样用硝酸溶解,不溶残渣用碳酸钠+硼酸混合试剂回收。强碱沉淀分离Fe元素,过滤,盐酸溶解氢氧化铁沉淀。以二苯胺磺酸钠做指示剂,采用重铬酸钾溶液滴定Fe;分取部分滤液,采用EDTA返滴定法测定其中的Al。本方法满足铝铁中Al含量范围在38%~65%和Fe含量范围35%~62%的检测要求。测定结果的相对标准偏差较小(RSD≯0.40%,n=10),分析结果准确度高、精密度好,可满足分析检测的要求。The combined determination of aluminum and iron in ferroaluminum was studied in this article.The sample is dissolved in nitric acid,and the insoluble residue is recovered using a mixed reagent of sodium carbonate and boric acid.Sodium hydroxide reacts with iron ions to form precipitates,the precipitate was collected by filtering operation,and then the ferric hydroxide precipitate was dissolved in hydrochloric acid.Titration of Fe^(3+) using potassium dichromate solution with sodium diphenylamine sulfonate as an indicator.Partial solution was separated,the Al ion in the solution was determinated by EDTA back titration method.This method was suitable for the determination of 38%-65%aluminum and 35%-62%iron in ferroaluminum.The relative standard deviation ≯0.40%(RSD,n=10)of the results.The analysis results have high accuracy and good precision,which can meet the requirements of analysis anddetection.

关 键 词：铝铁 联合测定 重铬酸钾 铁 EDTA 铝 

分 类 号：O655.2[理学—分析化学]