硝酸-氢氟酸槽液中氢氟酸含量的测定

Determination of Hydrofluoric Acid Content in Nitric Acid-hydrofluoric Acid Solution

通过加入过量定量的硝酸亚铈,与F-生成氟化亚铈沉淀,用EDTA容量法测定硝酸-氢氟酸槽液中剩余铈来计算氢氟酸含量。进行了氟化钠标准溶液验证实验、硝酸加入量干扰实验、合成样品实验、精密度实验及加标回收实验。结果表明:硝酸的加入量对氢氟酸含量的测定无影响;本方法的相对标准偏差小于2%;加标回收率在99.2%~101%。试验方法精密度好、准确度高,适用于硝酸-氢氟酸槽液中氢氟酸含量的准确测定。

by adding excess quantitative cerium nitrate and precipitating with F-,the remaining cerium content in hydrofluoric acid solution was determined by EDTA volumetric method.The verification test of sodium fluoride standard solution,the interference test of nitric acid addition,the synthesis sample test,the precision test and the spike recovery test were carried out.The test results are superficial:The amount of nitric acid added had no effect in the determination of hydrofluoric acid content;The relative standard deviation of this method is less than 2%,and the recovery from spiking is between 99.2%~101%.This method has good precision and high accuracy,and is suitable for the Determination of hydrofluoric acid content in nitric acid-hydrofluoric acid solution.