[Differentiation of species of blue inks for roller-ball pen and determination of relative writing ages by high performance capillary electrophoresis].
Traces of 13 blue roller-ball pen inks were identified by high performance capillary electrophoresis (HPCE) with 0.03 mol/L borate and 10% (in volume) methanol as buffer at the voltage of 15 kV and the temperature of 25 degrees C. Samples could be classified into 3 major groups and 5 subgroups by UV detection results and 4 species by visible detection results. The analytical results with different wavelength lights could be used to cross confirm the ink species. The aging effect was studied for 3 samples stored in darkness, and the relative ages were determined based on the relative quantities of some components. In addition, no effect of the matrix of paper was found on the results.
Wang
Yuanfeng
Y
Chinese People's Public Security University, Beijing 100038, China. specialjudie@163.com
Wang
Jinghan
J
Yao
Lijuan
L