紫外可见光谱法和主成分分析对蓝色圆珠笔油墨分类的研究

采用薄层色谱法和紫外可见光谱法分析34支蓝色圆珠笔油墨。截取400～700nm之间的紫外可见光谱数据进行主成分分析。主成分分析表明主成分1、2和3的累积贡献率已达96.5%,以主成分1、2对所有样品的得分值作图,对不同品牌的圆珠笔有很好的聚类作用。将主成分分析的分类结果同薄层色谱法的分类结果相比较,结果表明,采用主成分分析技术可以达到对蓝色圆珠笔油墨字迹的良好识别。

Characterisation of blue ballpoint pen inks using principal component analysis of UV-vis absorption spectra

Thirty four blue ball-point pens inks were examined on the basis of UV-Vis spectrum with a view to achieving good discrimination between the absorbance value in the range of 400～700nm,after appropriate transformations, were used as variables in principal component analysis.The analysis suggested that the cumulate reliability of PC1, PC2 and PC3(the first three principal components) were more than 96%,and the 2-dementional plot was drawn with the scores of PC1 and PC2,which was a good clustering analysis for discrimination of these pens.Compared to the result of TLC,It was found the PCA could provide a good method for the discrimination of blue ball-point pen.