废硫酸中氟离子测定方法的研究

Study on determination of fluoride in waste sulphuric acid

采用离子色谱法和离子选择性电极法对废硫酸中氟离子含量的测定进行了研究。试验结果表明:离子色谱法的方法检出限为0.017μg/mL,离子选择性电极法的方法检出限为0.0054μg/mL;两种方法的平均加标回收率分别为101.1%和99.3%,平行测定6次的标准偏差最高为0.0082%,相对标准偏差最高为7.74%,方法的准确度高,精密度良好。经过比对,离子色谱法和离子选择性电极法测定废硫酸中氟离子的含量并无显著性结果差异,能够满足废硫酸中氟离子含量的测定需要。

The determination of fluorine ion in waste sulphuric acid is studied by ion chromatography and ion selective electrode.The results show that the detection limit of ion chromatography method is 0.017μg/mL,the detection limit of ion selective electrode method is 0.0054μg/mL,the average recovery of the two methods is 101.1%and 99.3%,the maximum standard deviation of six parallel determinations is 0.0082%,the maximum relative standard deviation is 7.74%,the accuracy of the method is high and the precision is good.After comparison,there is no significant difference between the results of ion chromatography and ion selective electrode in the determination of fluorine ion content in waste sulphuric acid,which can meet the needs of the determination of fluorine ion content in waste sulphuric acid.