Abstract
An effective and economical nonaqueous micellar electrokinetic chromatography (NAMEKC) method was developed for the analysis of dye components with similar structure in red ballpoint pen inks. The new NAMEKC method using sodium dodecyl sulfate (SDS) micelle as pseudo-stationary phase in formamide/H2O medium provided higher resolution and better selectivity than other conventional capillary electrophoresis methods. In this study, the experimental parameters including solvent medium, acid concentration, SDS concentration, separation voltage and temperature, were optimized. The optimized conditions were formamide/H2O (90/10, v/v) with SDS at concentration of 100 mmol and 3.5 % acetic acid (v/v). The separation voltage and temperature were of 20 kV and 25 °C, respectively. Under the optimized conditions, a good separation of three red color dyes with similar structure was achieved. This method was successfully used to analyze several red ballpoint pen inks from different manufacturers with satisfactory result. Therefore, the proposed method could be useful for the discrimination of red ballpoint pen inks in questioned documents examination.
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This work was supported by the Scientific Research Common Program of Beijing Municipal Commission of Education (No. KM201110028009).
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Su, J., Xu, J., Zhong, S. et al. Analysis of Dye Components in Red Ballpoint Pen Inks by Nonaqueous Micellar Electrokinetic Chromatography with LIF Detection. Chromatographia 77, 471–478 (2014). https://doi.org/10.1007/s10337-013-2619-z
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DOI: https://doi.org/10.1007/s10337-013-2619-z