Ultrasensitive chemiluminescence detection of aM vanadium(IV) by capillary electrophoresis Original Research Article

Ultrasensitive chemiluminescence (CL) detection of aM vanadium(IV) in capillary electrophoresis (CE) is first reported. In this work, inclusion of the luminol in the electrophoretic carrier electrolyte avoids the loss of light signal that occurs when luminol and hydrogen peroxide are mixed in advance, as in the conventional method in CE–CL detection. The detection limit (S/N ratio=3) for V(IV) is 2.4×10−17 M (24 aM), which has been improved by a factor of 104 as compared with that of the most sensitive metal ion detection (Co2+ 0.5 pM) reported previously. In addition, the separation of V(IV) and V(V) has been performed successfully.