A novel method based on ionic liquid dispersive liquid-liquid microextraction (IL-DLLME) preconcentration and graphite furnace atomic absorption spectrometry detection was developed for the determination of nickel in lake water, tap water, and seawater samples. In the proposed method, 1-(2-pyridylazo)-2-naphthol (PAN) was used as the chelating agent, acetone as the dispersive solvent, and ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) as the extraction solvent instead of a volatile organic solvent. Some parameters influencing the IL-DLLME extraction efficiency of nickel and its...
