Adsorptive cathodic stripping voltammetric method with alizarin for the simultaneous determination of cadmium, and zinc in water samples

Abstract

This paper reports on the development of adsorptive cathodic stripping voltammetric (AdCSV) method with 1,2-dihydroxyanthraquinone or Alizarin (AZ) as a complexing agent used in the simultaneous determination of ultra trace of Cd and Zn because it has a good sensitivity, and selectivity. The influence of several parameters was studied: the effects of 1,2-dihydroxyanthraquinone or Alizarin (AZ) concentration, pH, accumulation potential, and accumulation time. The relative standard deviation (RSD), and recovery is determined to get the accuracy and precision method. It also determined the limit of detection (LOD) of the method to get the sensitivity. In this case, the optimum conditions were AZ concentration of 0.5 mM, pH 5, step deposition (70 s, -0.5 V). This method has been applied in water samples successfully, was obtained (Cd 23, and Zn 124) μg/L, LOD (Cd 0.006, and Zn 0.004) μg/L, RSD (Cd 0.4, and Zn 1.4) % (n = 10), recovery (Cd 99.36, and Zn 99.28)%. The Atomic absorption spectrometric (AAS) method is used as a comparison AdCSV optimum, was obtained (Cd 16, and Zn 115) μg/L.