A New Reagent for Solid Phase Extraction and Atomic Absorption Determination of Trace Amount of Fe(III) in Water Samples

Abstract

A solid phase extraction method was developed for the preconcentration of Fe³⁺ in water samples prior to it determinations by flame atomic absorption spectrometry using 2,2´-diamino-4,4´-bithiazole (DABTZ) as a new ligand. For this, metal complex with DABTZ was retained on the column. The retained analytes on the column were recoverd with 2.5 mL of methanol. Fe³⁺ in effluent was determined by atomic absorption spectrometry. The optimum preconcentration conditions have been investigated such as concentration and type of buffer, the effect of pH, type of elution solvent and eluent flow rate. The obtained recovery was nearly 85-93 by elution of the column octadcyl silica cartridge with minimal amount of solvent and concentration factor of 160 achieved by passing 400 mL of sample through the column. The relative standard deviation (3 replicate analyte) 1.90 % was obtained. The limit of detection, sensitivity and correlation coefficient of the proposed method are 2 ppm, 0.05 ppm and 0.992, respectively.