CAPILLARY ION ELECTROPHORESIS OF INORGANIC CATIONS IN STANDARD REFERENCE MATERIALS FROM VEGETABLE SOURCE

Taking into account the growing interest in applying capillary ion electrophoresis (CIE) for the determination of inorganic ions in real samples, this work focuses on CIE analysis of K+, Na+, Ca2+, Mg2+, and Mn2+ in botanical and food reference materials. Microwave-Assisted Digestion for sample preparation has been chosen ensuring a rapid, accurate, and reproducible treatment. A fused-silica capillary, 75 μm × 60 cm, a background electrolyte consisting of 6 mM imidazole and 10 mM α-hydroxy-isobutyric acid (HIBA). and indirect UV detection at 214 nm were used. Certified reference materials as Apple leaves SRM 1515 (NIST, USA), Beech leaves CRM 100, Rye flour CRM 381, Haricot beans CRM 383, and the green algae Ulva lactuca CRM 279 (BCR, Belgium) were selected. The optimal experimental conditions for microwave digestion and operational parameters in the electrophoresis system were studied. The calibration curves for K, Ca, Mg, and Mn ions were linear over the range of 0.6 ppm to 120 ppm and the detection lim...