溴酸钾法测定三氨基硝酸胍纯度  

Determination of purity of triaminoguanidine nitrate by potassium bromate method

作　　者：赵华丽[1] 韦雪梅[1] 刘梦 翟祥旺 闵学涛 聂海英[1] Zhao Huali;Wei Xuemei;Liu Meng;Zhai Xiangwang;Min Xuetao;Nie Haiying(Hubei Institute of Aerospace Chemotechnology,Xiangyang 441003,China)

机构地区：[1]湖北航天化学技术研究所,湖北襄阳441003

出　　处：《化学分析计量》2021年第5期51-54,共4页Chemical Analysis And Meterage

摘　　要：建立溴酸钾法测定三氨基硝酸胍(TAGN)纯度的分析方法。以溴酸钾为氧化剂,硫酸为酸化剂,控制溶液酸度为3~3.6 mol/L,溴酸钾与TAGN发生氧化还原反应,加入过量的碘化钾消耗剩余的溴酸钾,用硫代硫酸钠标准溶液滴定生成的碘,根据消耗的硫代硫酸钠标准溶液的量计算与TAGN反应的溴酸钾的量。在优化的试验条件下,测定结果的相对标准偏差为0.15%~0.20%(n=6),样品加标回收率为99%~102%。该方法操作简单,精密度好,准确度高,适用于三氨基硝酸胍纯度的测定。A method for the determination of purity of triaminoguanidine nitrate(TAGN)by potassium bromate was established.Potassium bromate was used as oxidant and sulfuric acid was used as acidifier.The acidity of the solution was controlled to be 3–3.6 mol/L,potassium bromate reacted with TAGN.Excess potassium iodide was added to consume the remaining potassium bromate.The generated iodine was titrated with sodium thiosulfate standard solution.The amount of potassium bromate reacted with TAGN was calculated according to the amount of sodium thiosulfate standard solution consumed.Under the optimized experimental conditions,the relative standard deviations of determination results were 0.15%–0.20%(n=6),and the recoveries were 99%–102%.The method is simple,precision,accuracy,which is suitable for the determination of the purity of guanidine triaminonitrate.

关 键 词：三氨基硝酸胍 纯度 溴酸钾法 

分 类 号：O657[理学—分析化学]