Solidified floating organic drop microextraction for the determination of cadmium in water samples by electrothermal atomic absorption spectrometry

Wipharat Chuachuad Chaiyasith, Arnon Thongsaw, Gareth M. Ross, Ratana Sananmuang


In the present work, a method for determining cadmium (Cd) in water samples was developed by solidified floating organic drop microextraction (SFODME) with 1-(2-Pyridylazo)-2-naphthol (PAN) as a chelating reagent and detected by electrothermal atomic absorption spectrometry (ETAAS). Under the optimized conditions, the calibration graph was linear in the range of 0.1 – 5.0 µg/L with a detection limit (LOD) of 0.053 µg/L. The relative standard deviation (%RSD) for 6 replicate measurements (1.0 µg/L) was ±2.67%. The proposed method was applied to tap water and drinking water samples. The accuracy of the proposed method as percentage recovery gave satisfactorily results.

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