title: A new CE with contactless conductivity detection method for the determination of complex cationic compositions: Application to the analysis of pen inks.
abstract: A CE with contactless conductivity detection methodology using a novel background electrolyte for the separation and determination of 17 metal cations (Cs+, Rb+, K+, Ca2+, Na+, Mg2+, Mn2+, Sr2+, Li+, Ba2+, Fe2+, Pb2+, Cd2+, Zn2+, Co2+, Cu2+and Ni2+) 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 Fe2+and Pb2+. 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.
authors: 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. jorge.saizg@gmail.com.
authors: Jorge
authors: J
authors: Sáiz
authors: 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.
authors: Carlos
authors: C
authors: Martín-Alberca
authors: Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Hanoi, Viet Nam.|3SAnalysis JSC, Thanh Xuan, Hanoi, Vietnam.
authors: Thanh Duc
authors: TD
authors: Mai
authors: 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.
authors: Carmen
authors: C
authors: García-Ruiz
mesh_terms: D002412:Cations / Q000032:analysis*; D004553:Electric Conductivity; D019075:Electrophoresis, Capillary / Q000379:methods*; D007281:Ink; D057230:Limit of Detection; D016014:Linear Models; D008670:Metals; D015203:Reproducibility of Results
chemical_list: D002412:Cations; D008670:Metals
keywords: Capillary electrophoresis; Cations; Contactless conductivity detection; Metals; Pen inks