论文部分内容阅读
采用容量法测定硼铁矿及硼镁铁矿中硼含量,通过选择最佳分析条件,可满足科研和生产对硼元素的分析要求。试样用盐酸、硝酸分解,用碳酸钡分离铁、锰、铝等干扰元素,在酸性溶液中煮沸驱除CO_2,调节PH为7时,在甘露醇存在下,以酚酞作为指示剂,以NaOH标准溶液滴定。测定范围0.20―20.00﹪。
The volumetric method is used to determine the content of boron in the pyroxene and the boraxite. By selecting the best analysis conditions, the boron content in the research and production can be satisfied. The sample is decomposed with hydrochloric acid and nitric acid, and the interference elements such as iron, manganese and aluminum are separated by barium carbonate, and CO 2 is boiled in an acidic solution to adjust the pH to 7. In the presence of mannitol, phenolphthalein is used as an indicator and NaOH standard Solution titration. The measurement range 0.20-20.00%.