Abstract
A simple and sensitive method based on the dispersive liquid-liquid microextraction (DLLME) technique combined with UV-Vis spectrophotometry analysis has been developed for the determination of boron concentration in water samples. The method is based on ion-association formation of boron as boron tetraflouride (BF4) with methylene blue (MB+) and extraction of the hydrophobic complex (BF4:MB) using the DLLME technique. Some important parameters, such as reaction conditions and the kind and volume of extraction solvent and disperser solvent were studied and optimized. Under the optimized experimental conditions, Beer’s law was obeyed over the concentration ranges of 0.50-50 ng mL-1. The apparent molar absorptivity and Sandell’s sensitivity of ion-pairing product were 3.39×105 L mol-1 cm-1 and 0.032 ng cm-2, respectively. Also, the enrichment factor and extraction recovery obtained were 24.68% and 98.74%, respectively. The proposed method was successfully applied for determination of boron concentration in water samples. In addition, excellent agreement was observed between this proposed method and the reference method.
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