酸碱滴定法快速测定硼铁中硼

Fast Determination of Boron in Ferroboron by Acid-base Titration

试样以过氧化钠熔融分解后,用热水浸取,加热煮沸除尽H2O2,定容后过滤铁等干扰元素沉淀与硼分离,滤液中铝元素影响硼的分析,加碳酸钙沉淀分离,以对硝基酚为指示剂,用盐酸滴定至中性。加入甘油与硼酸生成酸性较强的甘油硼酸,以酚酞为指示剂,用氢氧化钠标准溶液滴定硼酸,取得了满意的结果。

After the sample was fused and decomposed by sodium peroxide, hot water was used to leach, heat and boil it to remove H2O2.With its volume fixed, interfering elements such as iron were filtrated to precipitate and be separated from boron. Because the element aluminium in the filtered solution impacted the analysis of boron, calcium carbonate was added to make it precipitated and separated. With p-nitrophenol as an indicator, hydrochloric acid was used to titrate it to neutral. Glycerine was added to form strong glycerine-boric acid with boric acid. Then with phenolphthalein as an indicator, the standard solution of sodium hydroxide was used to titrate boric acid, obtaining satisfactory results.