近红外分析方法测定润滑油基础油粘度指数

采用PLS校正方法建立了近红外光谱－粘度指数校正模型，能够覆盖多种源油、多种工艺及牌号的基础油。使用该模型对23个样品的对比测定结果表明，验证集标准误差（SEV）为2．13。成对t检验结果表明，近红外分析方法与标准分析方法测定的粘度指数没有显著性差别，具有重现性好、分析速度快，结果准确等特点，可以代替传统方法进行润滑油基础油粘度指数的测定。

DETERMINATION ON VISCOSITY INDEX OF LUBE BASE OIL BY NIR

The PLS calibration method is used to set up the calibration model of NIR spectra-viscosity index which is suitable for many kinds of base oils.Twenty-three samples are tested by this model,indicating that the standard error of validation (SEV)is 2.13.The result of paired t test shows that the VI determined by NIR method is almost the same as the VI determined by standard method.The NIR method,with its advantages of better repeatability,shorter time of testing,sampler operation,can be used as alternative for determining the VI of lube base oils.