新型Nessler管粘度法和传统方法测定多聚磷酸浓度的比较

通过精确测定浓度范围在110%～119%的多聚磷酸的浓度,配之以理论分析,系统地比较研究了新型Nessler管粘度法和传统的酸碱滴定法、平均链长法的测试精度及稳定性.对于Nessler管粘度法,通过Matlab软件对数据的分析,得到多聚磷酸的粘度-浓度关系曲线,从理论上证明了在多聚磷酸浓度大于115%时该方法具有显著的优越性.同时,通过分析多聚磷酸的粘度-温度关系,定量地估计了控温精度对浓度测试精度的影响.更重要的是通过对Nessler粘度管的改进,大大地提高了多聚磷酸得测试精度及重复性.

Comparation of Nessler Tube Method and Traditional Method for Determination of Polyphosphoric Acid

The accuracy and consistency of the new Nessler tube method were systematically studied versus the traditional acid-base titration and average chainlength methods through concentration measurements on polyphosphoric acid(PPA) with concentrations ranging from 110% to 119%.Quantitative analysis of relationship between viscosity and concentration clearly showed the superiority of the Nessler tube method especially when the concentration was above 115%.Study of PPA's viscosity-temperature property also gave quantitative estimation on errors caused by temperature fluctuation.Most importantly,the accuracy of the method had been greatly improved through modification of the Nessler tube.