Over the past two decades, electrolyte cathode discharge-atomic emission spectrometry (ELCAD-AES) has received a rapid development [1–5]. It is considered a very promising alternative miniaturized excitation source which possesses potential advantages over commercially and analytically successful plasma sources because of its more compact
and portable instruments, lower power consumption (b75 W), no inertgas requirement and operation in atmospheric pressure air [6,7]. Also,ELCAD has been successfully employed for the real time and on-line simultaneously detection of multi-elements in aqueous solution [8,9].