| Summary: | In this study, solution scanometry is presented as a highly sensitive, simple and rapid method for the colorimetric determination of palladium ion in water samples and walnut leaf. The method is based on the formation of a rose-brown complex between Pd2+ ion and an excess of iodide in acidic medium in Plexiglas cells, which are scanned by conventional flatbed-scanner, and the colour of each cell is analysed by software written in Visual Basic (VB 6) media to determine red, green and blue values. The relative standard deviation and linear range of the method were determined to be 1.0% and 0.1–72.0 μg mL−1, respectively. The proposed method was successfully applied for the determination of Pd2+ ion in water samples and walnut leaf.
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