oa South African Journal of Chemistry - Development of a reliable method for the spectrophotometric determination of palladium(II) with o-methoxyphenyl thiourea : separation of palladium from associated metal ions : research article



A simple and sensitive method is described for the solvent extraction and spectrophotometric determination of palladium(II) using low concentrations of o-methoxyphenyl thiourea (OMePT). Trace concentrations of palladium(II) were quantitatively extracted when equilibrated with OMePT in chloroformat 1.0 mol L-1 hydrochloric acid media for 10 s. The absorbance of a yellow coloured palladium(II)-OMePT complex was measured at 325 nm. The palladium(II)-OMePT complex was stable for more than 72 h. The composition of extracting species was 1:1, determined by mole ratio, Job's continuous variation method and it was confirmed by a log-log plot. Beer's law was obeyed up to 15.0 µg mL-1. The molar absorptivity and Sandell's sensitivity were 3.38 x 103 L mol-1 cm-1 and 0.031 µg cm-2, respectively. The method was free from a large number of interferences from cations and anions. The method was applied for separation of palladium(II) from multi-component mixtures and synthetic mixtures corresponding to alloy.


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