NACE Discrimination of Black Ballpoint Pen Inks |
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Authors: | Hong Zou Zhiyong Wang Nengsheng Ye Rongfu Xu Ruohua Zhu Bingjuan Wang Xuexin Gu |
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Institution: | (1) Department of Chemistry, Capital Normal University, Beijing, 100037, People’s Republic of China |
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Abstract: | A non-aqueous capillary electrophoresis (NACE) method was developed for analyzing seven basic dyes contained in black ballpoint
pen inks. Baseline separation of the studied compounds was achieved on a 57 cm × 75 μm capillary by using a non-aqueous solution
composed of 1.0% acetic acid and 60 mM ammonium acetate in methanol medium. Based on the pattern of NACE electropherograms,
120 black ballpoint pens from different manufacturers were divided into six groups in terms of dye categories. Moreover, the
black ballpoint pens from the same group may be further distinguished by cluster analysis based on the content of different
dyes and some unknown peaks. Our results indicated that the developed NACE method is a credible warrant for investigation
of the fraudulent documents. |
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Keywords: | Capillary electrophoresis Discrimination Basic dye Black ballpoint pen |
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