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An alternative methodology based on the combination of microextraction with flame atomic absorption spectrometry (FAAS) is reported for the determination of Pd 2+  in environmental samples. Cetyltrimethyl ammonium bromide (CTAB) was used as a cationic surfactant and a precipitating agent. The method involves the formation of a PdI 42−  complex with Pd 2+  in the presence of iodide and CTAB causes PdI 42−  to precipitate. The method was performed using 0.01% (w/v) CTAB and 0.1% (w/v) KI in 35 mL 0.1% (v/v) nitric acid for the preconcentration of Pd 2+ . Under the optimized conditions, the calibration curve was linear between 20 and 170 μg L −1  with a correlation coefficient of 0.9964. The limit of detection and preconcentration factor were 2.4 µg L −1  and 35 for Pd 2+ . The results showed that this solvent-free microextraction is simple and sensitive for the preconcentration and determination of micrograms per liter of Pd 2+  in seawater, stream water, and road dust with 94% to 103% spiked recoveries.

analytical letters

Preconcentration and Determination of Palladium by Solvent-Free Microextraction and Flame Atomic Absorption Spectrometry (FAAS) in Environmental Samples