Journal
MICROCHIMICA ACTA
Volume 168, Issue 1-2, Pages 153-159Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-009-0275-7
Keywords
Ultrasound-assisted emulsification; Solidified floating organic drop microextraction; Flame atomic absorption spectrometry; Preconcentration; Zinc
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Funding
- Development Foundation of the Department of Education of Hebei Province, P R China
- Research Development Foundation of the Agricultural University of Hebei
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A simple and efficient liquid-phase microextraction technique was developed using ultrasound-assisted emulsification solidified floating organic drop microextraction (USAE-SFODME) combined with flame atomic absorption spectrometry, for the extraction and determination of trace amounts of zinc in water samples. 1-(2-Pyridylazo)-2-naphthol (PAN) was used as chelating agent. The main parameters affecting the performance of USAE-SFODME, such as type of extraction solvent as well as extraction volume, time, temperature, pH, the amount of the chelating agent, and salt effect were investigated and optimized. Under optimized experimental conditions a preconcentration factor of 76 was obtained using only 5.0 mL of water sample. The calibration graph was linear in the range from 20 to 450 mu g L-1 with a detection limit of 0.79 mu g L-1. The relative standard deviation for ten replicate measurements of 20 and 300 mu g L-1 of zinc were 4.0 and 2.8 %, respectively. The proposed method was applied to tap water, sea water, and river water, and its accuracy was assessed through the analysis of certified reference water and recovery experiments.
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