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中国无机分析化学:2017,7(3):65-67
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硫酸铁铵滴定法测定钨钛合金中钛的含量
(西部金属材料股份有限公司,陕西宝鸡 721014)
Determination ofTitanium Content in Tungsten-titanium Alloys by Ammonium Ferric SulfateTitrimetry
(Western Metal Materials Co.,Ltd., Baoji,Shaanxi721014, China)
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投稿时间:2016-12-07    修订日期:2017-01-15
中文摘要: 建立了硫酸铁铵滴定法测定钨钛合金中钛含量的新方法。以硝酸-氢氟酸溶解样品,在25 mL NaOH(100 g/L)的强碱性介质中,以铁为载体,沉淀分离被测定元素钛后,用盐酸溶解沉淀。在酸性条件下,用铝片还原Ti4+至Ti3+,以硫氰酸盐为指示剂,用硫酸铁铵标准溶液滴定至红色为终点。根据消耗硫酸铁铵滴定溶液的体积,求得样品中钛含量。按照实验方法测定样品中钛含量,结果的相对标准偏差(RSD,n=11)为0.40%,加标回收率为99.8%~101%。方法有很好的精密度和准确度,可用于钨钛合金中钛含量的分析。
中文关键词: 钨钛合金    滴定法  硫酸铁铵  沉淀分离
Abstract:A new method for the determination of titanium in Tungsten-titanium alloys byammonium ferric sulfate titrimetry was established. The sample was dissolved in HNO3-HF solution. Titanium was precipitated with iron as the carrier in NaOH(100 g/L) alkaline medium, then the precipitate was dissolved in hydrochloric acid. Under acidic conditions, Ti4+ was reduced to Ti3+ by aluminum metal, and Ti3+ was titrated by ammonium ferric sulfate standard solution with thiocyanate as indicator. The method was applied to the real samples and RSD (n=11)of 0.40% was achieved with the recovery rate from 99.8% to101%.
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杨军红,李 佗,翟通德,李荣,魏 东,李娟.硫酸铁铵滴定法测定钨钛合金中钛的含量[J].中国无机分析化学,2017,7(3):65-67.
YANG Junhong,LI Tuo,ZHAI Tongde,LI Rong,WEI Dong,LI Juan.Determination ofTitanium Content in Tungsten-titanium Alloys by Ammonium Ferric SulfateTitrimetry[J].Chinese Journal of Inorganic Analytical Chemistry,2017,7(3):65-67.

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