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Solidified floating organic drop microextraction (SFODME) was utilized as a separation or pre-concentration step prior to electrothermal atomic absorption spectrometric (ETAAS) determination of ultra-trace amounts of lead. The method was based on the formation of an extractable complex between Pb(II) and 1-(2-pyridylazo)-2-naphathol (PAN) as a chelating agent. The main parameters affecting the performance of SFODME, namely, type and volume of organic solvent, pH, concentration of the chelating agent, extraction time, stirring rate, extraction temperature, disperser solvent, ionic strength, and interference effect were investigated and optimized. Under optimized experimental conditions a pre-concentration factor of 22.03 and a detection limit of 0.064 μg L for the pre-concentration from 13.0 mL water sample was achieved. The relative standard deviation of the measurements in the range of 1.3 – 2.5% (n = 6). The proposed method was assessed through the analysis of certified reference water and recovery experiment with satisfactory results.

the malaysian journal of analytical sciences

SOLIDIFIED FLOATING ORGANIC DROP MICROEXTRACTION–ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY FOR THE DETERMINATION OF TRACE AMOUNTS OF LEAD IN WATER SAMPLES