Potentiometric titration analysis of triethylamine and xylidine based on smooth derivation of savitzky-golay

Abstract

The titration curve is not obvious during the potentiometric titration analysis of the sample containing xylidine, and there is interference noise. The Savitzky-Golay smoothing method is used to eliminate the local noise effect in the titration curve, and the first-order derivation curve is obtained. The method performs polynomial fitting and derivation on each data point in the titration curve by aliquoting the moving window, and obtains the most effective information while eliminating noise. According to the standard sample measurement result error optimization window width and polynomial fitting times, the titration curve is smoothed by five points to obtain the ideal measurement result. The analysis of the actual sample shows that the smooth derivation method can more accurately detect the titration end point of the titration curve, and is simpler, faster and more reliable than the mapping method.