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Ferrosilicon is the deoxidizer and alloying agent in steel-making process as well as aluminum content is the more important quality index. It is suggested that the sample should be dissolved with nitric acid and hydrofluoric acid as well as Fe, Mn, Ti and other elements should be precipitated by sodium hydroxide to separate from aluminum so that the aluminum and EDTA can form complex in subacidity for the experiment. Excessive EDTA is titrated with copper sulfate standard solution and PAN is as the indicator. The repeatability limit r and reproducibility limit R of EDTA titration are determined by precision experiment and mathematical statistics to be used for quality decision of method detection to ensure the accuracy of detection results.

, authors=Jing-tao Zhou, Ying Wang, authorsList=Jing-tao Zhou, Ying Wang, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1319243407025877910, articleId=1319243406501589908, tenantId=1146029695717560320, journalId=1185652524569653253, language=CN, title=EDTA滴定法测定硅铁中的铝, columnId=1185882040642716431, journalTitle=包钢科技, columnName=其他, runingTitle=null, highlight=null, articleAbstract=

硅铁合金是炼钢工艺中的脱氧剂及合金剂，其中铝含量是比较重要的质量指标。试验提出以硝酸、氢氟酸溶解试样，氢氧化钠沉淀铁、锰、钛等元素使之与铝分离，在微酸性中使铝与EDTA形成络合物，以PAN为指示剂，用硫酸铜标准溶液滴定过量的EDTA。通过精密度实验，经数理统计后确定了EDTA滴定法的重复性限r和再现性限R，用于方法检测的质量判定，保证检测结果的准确度。

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周景涛（1969-），女，辽宁省瓦房店市人，硕士，正高级工程师，现从事冶金分析技术管理工作。

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周景涛（1969-），女，辽宁省瓦房店市人，硕士，正高级工程师，现从事冶金分析技术管理工作。

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