红外光谱法用于快速测定车用柴油酸度等性质的研究

针对车用柴油酸度等性质测定过程繁琐，采用衰减全反射样品池测定车用柴油的红外光谱，用偏最小二乘法（PLS）建立红外光谱测定车用柴油酸度、密度、闪点和凝点的4个校正模型，验证标准误差分别为0.46 mg/(100 mL),0.77kg/m3,2.60 ℃,2.77 ℃，该方法符合标准方法再现性要求。与标准方法相比，该方法具有无需预处理、操作简单、测量快速、重复性好等优点。

FAST DETERMINATION OF ACIDITY AND OTHER PROPERTIES OF DIESEL BY INFRARED SPECTROSCOPY

To fast determine the acidity and other properties of the automotive diesel, the attenuated total reflection sample cell was used to obtain the infrared spectra of the samples. The IR spectra were further analyzed with partial least squares (PLS) to establish four calibration models, which were used to determine the acidity, density, flash point and freezing point of diesel fuel samples. The validation standard errors were 0.46 mg/(100 mL), 0.77 kg/m3, 2.60 ℃ and 2.77 ℃, respectively. The method meets the requirements of the reproducibility of standard method. Compared with the standard method, the new established method showed the advantages of no pretreatment, simpler process, shorter test time and better repeatability.