Sáiz Jorge, Martín-Alberca Carlos, Mai Thanh Duc, García-Ruiz Carmen
Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, and University Institute of Research in Police Sciences (IUICP)-University of Alcalá, Ctra, Madrid-Barcelona, Km. 33,6. Alcalá de Henares 28871, Spain.
Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Hanoi, Viet Nam.
Electrophoresis. 2016 Oct;37(21):2896-2902. doi: 10.1002/elps.201600220. Epub 2016 Aug 29.
A CE with contactless conductivity detection methodology using a novel background electrolyte for the separation and determination of 17 metal cations (Cs , Rb , K , Ca , Na , Mg , Mn , Sr , Li , Ba , Fe , Pb , Cd , Zn , Co , Cu and Ni ) and ammonium has been investigated. The buffer, based on lactic acid and β-alanine, was experimentally compared with other two commonly used electrolytes, showing important improvements, such as shorter analysis times (<11 min), better electrophoretic resolutions and higher detectabilities for certain analytes, such as Fe and Pb . The inclusion of other additives such as 18-Crown-6 and α-hydroxyisobutyric acid was studied in order to obtain the best separation of the analytes of interest. The optimised method was applied to the analysis of 11 water-based pen inks and the determination of their metal composition. The methodology was demonstrated for the comparison and differentiation of pen inks.
