Glassy Carbon Electrode Modified with Alizarin Red S as a Working Electrode for the Analysis of Cobalt in Water and Hair Using Adsorptive Stripping Voltammetry

摘要

In the present work, glassy carbon electrode (GCE) modified with Alizarin Red S (ARS) wasemployed for the determination of cobalt in waters and human hair by square wave cathodic adsorptivestripping voltammetry (SW–CASV). The method is based upon the selective and interfacialaccumulation of Co (II) ion on GCE surface treated by Alizarin Red S. The parameters influencing onthe determination efficiency e.g. pH and type of supporting electrolyte, accumulation potential andtime, scan rate, and ionic strength were discussed and optimized systematically. The method submittedin the current study is able to track ultra-trace concentrations of Cobalt in variety of samples where thelimit of detection (LOD) was 0.14 ± 0.006 pM, while, the linearity was in the range of 2.00 – 80.00pM at optimezed conditions. The evaluation of the proposed method was successfully carried out bythe analysis of cobalt content in natural waters and human hair and the results were compared withstandard ICP method.