Deep-eutectic-solvent-based dispersive and emulsification liquid–liquid microextraction methods for the speciation of selenium in water and determining its total content levels in milk formula and cereals

Rapid and environmentally friendly ultrasound-assisted dispersive liquid–liquid microextraction (US-DLLμE) and vortex assisted-emulsification liquid–liquid microextraction (VA-ELLμE) methods are proposed for the speciation of selenium in domestic and mineral water samples.