分析与生物分析技术杂志

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Organised Surfactants Assemblies and Spectrophotometry: Application to The Analysis of Palladium (II) in Different Matrices

Mostafa MM, Akl MA and Elbadrawy Z

In this study, the use of organised surfactants assemblies to enhance the spectrophtometric determination of palladium in environmental samples is thoroughly investigated. Phenanthraquinone monophenyl thiosemicarbazone (PPT), an exceptional color-forming chelating agent, combines to Pd (II) to form a slightly soluble complex in aqueous solution. To determine this metal ion, a tedious and inefficient separation technique, such as liquid–liquid extraction, has to be achieved. However, the Pd (II)-PPT complex could be determined suitably by ultraviolet-visible (UVVis) spectrophotometry at 520 nm in a Tween 80 micellar medium that has polyoxyethylene groups. After conditions, such as the pH, the concentration of PPT and the stability, were adjusted to their ideal values, the sensitivities of the Pd (II) ions in the Tween 80 micellar medium and in chloroform were compared. The sensitivity of Pd (II) in the Tween 80 micellar medium was higher than in chloroform. The interferences from different cations and anions were studied. Beer’s law was obeyed over a concentration range of 0.1-1.0 mg L^–1. The detection limit of Pd (II) is 0.01 mg L^–1. The recovery yields of palladium (II) in the synthetic mixtures and water samples ranged from 98 to 100% with a relative standard deviation (RSD%) less than 1.0%. The proposed method was successfully applied to the determination of palladium in certified reference samples, synthetic mixtures and in environmental water samples. This proposed technique is simple, convenient and speedy.