A rapid and efficient method based on ionic liquid dispersive liquid–liquid biomicroextraction (ILDLLBME)
was used for speciation and preconcentration of Chromium (III, VI) in human blood samples
before determination by electro-thermal atomic absorption spectrometer (ET-AAS). In this method,
1-hexyl-3-methylimidazolium hexafluorophosphate as a ionic liquid was dissolved in acetone as a dispersant
solvent and then the binary solution was rapidly injected by a syringe into the blood samples
containing CrIII, which have already complexed by acetyl cysteine (NAC) at optimized pH. Under the
optimal conditions, the linear range (LR), limit of detection (LOD) and preconcentration factor (PF) were
obtained 0.03–4.4 g L−1, 0.005 g L−1 and 10 respectively (RSD