Anodic stripping differential pulse voltammetric.determination of trace amounts of lead after preconcentration of its complex with 2-(5-bromo-2- pyridylazo)-5-diethylaminophenol onto natural analcime zeolite by column method

Abstract

This work assesses the potential of natural Analcime Zeolite as an adsorbent for preconcentration of lead (II) traces. Lead is quantitatively retained on 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol by column method with Analcime in the pH range of 5-6.5 and 2 mL min-1 flow rate. Lead was removed from the column with 10.0 mL of 4 M hydrochloric acid and was determined by anodic stripping differential pulse voltammetry. 0.5 ppb detection limit was obtained and linear dynamic range was 3 to 1.2 × 105 ppb in final solution with correlation coefficient of 0.999 and relative standard deviation of ± 1.2% (for eight replicate determination of 2.5 μg mL-1 of lead). Various parameters such as the effect of pH, flow rate, instrumental conditions and interferences of some ions on the determination of lead have been studied in detail for optimization of conditions. The method was successfully applied for determination of lead in various samples.