Flame atomic absorption spectrometry determination of trace amount of cobalt (ii) after preconcentration using modified analcime zeolite loaded with bis-(2-hydroxy-l-naphthaldimine) -N-diethylene-triamine

Abstract

A simple and sensitive flame atomic absorption spectrometry technique was developed for the determination of trace amounts of cobalt (Co) in various samples after adsorption on modified analcime using a recently synthesized tetradentate Schiff base ligand, bis-(2-hydroxy-1-naphthaldimine) -N-diethylene-triamine, by a column method in the pH range of 5 to 7, with a flow rate of 1 mL/min. The influence of flow rates of the stripping and sample solution, the amount of ligand, types of stripping, and the least amount of eluent required for eiution of the Co ion from the column were investigated. The effects of interfering ions on the recovery of Co were studied. The method was successfully applied for determination of Co in water and plant samples. The maximum capacity of the modified sorbent was found to be 0.58 mg/g of Co(ll); the preconcentration factor was 250. Linearity was maintained at 0.2-40 μg/L in the original solution. The LOD was 1.44 × 10-2 μg/L in the original solution.