论文部分内容阅读
试样加盐酸溶解、硝酸氧化破坏碳化物后,加入过量氢氧化钠使铁离子沉淀过滤,滤液在过量EDTA存在下,加热煮沸,使铝和其他阳离子全部和EDTA络合,在六次甲基四胺溶液介质中,以二甲酚橙溶液为指示剂,用锌标液滴定过量的EDTA。以氟化钾络合EDTA-AL中的铝,释放出相当于铝量的EDTA,以锌标准溶液滴定,求得铝含量,方法准确,测定范围:1.0～12.0%。
After the sample is dissolved in hydrochloric acid and the nitric acid is oxidized to destroy the carbides, excess sodium hydroxide is added to precipitate iron ions. The filtrate is heated and boiled in the presence of excess EDTA so that all the aluminum and other cations are complexed with EDTA. Tetraamine solution medium, with xylenol orange solution as an indicator, titration with EDTA excess EDTA. Aluminum complexation of EDTA-AL with potassium fluoride to release the equivalent of aluminum EDTA, zinc standard titration solution obtained by aluminum content, accurate method, the determination of the range: 1.0 ~ 12.0%.