A Critical Comparison of Hanging Mercury Drop Electrode and Long Lasting Sessile Drop Mercury Electrode in A.C. Anodic Stripping Voltammerty

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Abstract
The hanging mercury drop electrode (HMDE) and the long lasting sessile drop mercury electrode (LLSDME) currently used in trace metal analysis are critically compared. Alternating current anodic stripping voltammetry (AC-ASV) and alternating current linear sweep voltammetry (AC-LSV) respectively are employed for the determination of Zn,Cd, Pb, Cu and Fe. The influence of the electrolysis time, stirring rate, a.c. amplitude, frequency and scan rate on the peak current is evaluated. Analytical measurements were carried out by the standard addition method, using 0.02 mol/l HClO4 + 0.1 mol/l NaClO4 (Zn, Cd, Pb, Cu) and 0.1 mol/l (COONa)2, (Fe), respectively as supporting electrolytes.