Spectrophotometric Determination of Fe~(~(3+)) and Pb~(~(2+)) in Real Samples after Micelle-mediated Extraction

摘要

A cloud-point extraction process using micelle of the cationic surfactant CTAB to extract Fe~(3+)and Pb~(2+) from aqueous solutions was investigated. The method is based on the color reaction of Fe~(3+)and Pb~(2+) with bromopyrogallol red at pH 5.0 and micelle-mediated extraction of the complex. The optimal extraction and reaction conditions (e.g., surfactant concentration, reagent concentration and effect of time) were studied and the analytical characteristics of the method (e.g., limit of detection, linear range, preconcentration and improvement factors) were obtained. Linearity was obeyed in the range of 0.05-43.00 ng mL~(-1) of Fe~(3+) ion and 0.10-40.00 ng mL~(-1) of Pb~(2+) ion and the detection limit of the method was 0.020 and 0.040 ng mL~(-1) for Fe~(3+) and Pb~(2+), respectively. The interference effect of some anions and cations was also tested. The method was applied to the determination of Fe~(3+) and Pb~(2+) in vegetable (lettuce, spinach, cabbage, parsley, and dill), tea, rice, human hair, liver, and chicken and water samples.