Solvent extraction-spectrophotometric determination of boron in steel with 2,4-dinitronaphthalene-1,8-diol and Brilliant Green
Solvent extraction-spectrophotometric determination of boron in steel with 2,4-dinitronaphthalene-1,8-diol and Brilliant Green
复制标题
2,4-二硝基萘-1,8-二醇和亮绿溶剂萃取分光光度法测定钢中硼
作者：
K. Tǒei;S. Motomizu;M. Oshima;H. Watari
在前人工作的基础上，采用溶剂萃取法测定钢中硼。硼（以硼酸形式）在乙酸介质中转化为单价复合阴离子 BR2–（其中 H2R 为 2,4-二硝基萘-1,8-二醇），以与亮绿相关的有色离子形式萃取到甲苯中，并通过分光光度法测定。将钢样品溶解在稀盐酸和过氧化氢的混合物中，通过用 4-甲基戊烷-2-酮进行溶剂萃取或通过以氢氧化物或氧酸盐形式沉淀来除去溶液中的大量铁和其他金属离子。测定了钢样品中的微量硼 (0.0013–0.012%)。
On the basis of previous work, a solvent extraction procedure has been applied to the determination of boron in steel. The boron (as boric acid) is converted to the monovalent complex anion, BR2–(where H2R is 2,4-dinitronaphthalene-1,8-diol), in acetic acid medium, extracted as a coloured ion associate with Brilliant Green into toluene and determined spectrophotometrically. Steel samples were dissolved in a mixture of dilute hydrochloric acid and hydrogen peroxide and large amounts of iron and other metal ions in the solution were removed either by solvent extraction with 4-methylpentan-2-one or by precipitation as hydroxides or oxinates. Micro amounts of boron in steel samples (0.0013–0.012%) were determined.