水蒸气蒸馏—酸碱滴定法测定氮钒合金中氮

Determination of the Nitrogen in Vanadium Nitrogen Alloy by Steam Distillation and Acid-base Titration

样品用硫酸、磷酸溶解,样品溶液用氢氧化钠溶液碱化后,以水蒸气蒸馏,蒸馏出的氮用硼酸溶液吸收。以甲基红—次甲基蓝为指示剂,用氨基磺酸标准溶液滴定,根据氨基磺酸标准溶液消耗量,计算样品中的氮含量。方法精密度高,结果准确,相对标准偏差(n=6)<0.736%,加标回收率在99.2%～100.5%。

Samples are dissolved with sulfuric acid and phosphoric acid, alkalized with sodium hydroxide solution and distilled with steam. The distilled nitrogen is absorbed with boric acid solution. Making methyl red-methylene blue as indicator, titrating with amino sulfonic acid standard solution and according to the consumption of the amino sulfonic acid standard solution, the content of nitrogen in the sample is calculated. The precision of this analysis method is high and the results are accurate, the relative standard deviation is less than 0.736% and the recovery ratio is between 99.2% and 100.5%.