Separation and Preconcentration of Ultra Traces of Some Heavy Metals in Environmental Samples by Electrodeposition Technique Prior to Flame Atomic Absorption Spectroscopy Determination (ED-FAAS)

In this approach, electrodeposition was developed for separation of ultra traces of some heavy metals from the complex matrices prior to determination by ame atomic absorption spectroscopy. The electrodeposition is carried out at optimized parameters of pH and temperature of electrolyte, voltage and duration time of deposition. The calculated LOD for ED-FAAS for the interested elements was found as follows: 1.27 ng mL􀀀1 for Co, 0.14 g mL􀀀1 for Re, 1.56 ng mL􀀀1 for Ni, 1.84 ng mL􀀀1 for Au, 0.02 g mL􀀀1 for Pt and 6.67 ng mL􀀀1 for In. Characteristic concentration for Co, Re, Ni, Au, Pt and In in ED-FAAS technique are 1.72, 660, 2.67, 2.99, 30 and 9.60 ng mL􀀀1 with %RSD as 1.54, 2.69, 2.45, 2.77, 2.38 and 2.55, respectively. These elements were measured in some environmental samples. Concentration of Co and Ni in a mineral water are 12.46 and 21.43 ng mL􀀀1, respectively, concentration of Re in a molybdenum mineral concentrate is 4.65 g mL􀀀1, concentration of Au in a geological samples is 6.00 ng mL􀀀1. It was also found that the recovery test for spiked Pt and In to a waste water samples is promising using the proposed technique.