Three structurally different ionic liquids (ILs), namely 1-butyl-3-methylimidazolium chloride([BMIM][Cl]),
1-(6-hydroxyethyl)-3-methylimidazolium chloride ([HeOHMIM][Cl]) and 1-benzyl-3-(2-hydroxyethyl)imidazolium bromide ([BeEOHIM][Br]), were applied as extraction solvents using in situdispersive liquid–liquid microextraction (in situ DLLME) for the preconcentration of two microcystin vari-ants, microcystin-RR (MC-RR) and microcystin-LR (MC-LR) from aqueous samples.