Abstract
A Fisons Quattro I electrospray ionization (ESI) source has been modified to produce stable electrospray ion currents at flow rates as low as 50 nL/min. The original counter electrode and skimmer cone lens of the Fisons ESI source have been replaced with a spherical cone lens. This improved source provides a greater range of x,y,z positioning of a stainless steel tip resulting in a stable ion signal for flow rates of 50 nL/min to 2 μL/min. A tapered stainless steel electrospray tip (50 μm i.d.) was evaluated for mass spectrometry using nano-liquid chromatography (50 μm i.d., flow rate = 120 nL/min) and sheathless capillary electrophoresis. The analysis of a nonionic surfactant, octylphenol ethoxylate, was accomplished with both nanoscale separation techniques. © 1998 John Wiley & Sons, Ltd.
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