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

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

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。

Thirty four blue ball-point pens inks were examined on the basis ofUV-Vis spectnma with a view to achiev- ing 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.