Summary of thesis EME is an emerging sample preparation technique and a supported liquid membrane (SLM) is an important part of it. In this literature-based study, organic solvents used as SLM was reviewed. Prior to discussing SLMs, introduction to EME, classification and common properties of liquid membrane are given. In EME, charged analytes are extracted from sample solution into acceptor solution through organic solvent (SLM). The mass transfer has been described by a steady state model and transit model. Strong acids and bases are used to maintain pH and ionization of target analytes. The stability of EME system is obtained by controlling pH and providing low extraction voltage. EME devices uses supported liquid membrane and free liquid membrane as organic solvent configuration. Commonly used devices for EME are static EME, dynamic EME, one chip EME, parallel EME, continuous flow EME and micro EME. Liquid membranes are classified into emulsion liquid membrane (ELM), bulk liquid membrane (BLM) and supported liquid membrane (SLM); and according to transport mechanism, liquid membranes are classified into simple transport, facilitated transport and active transport. General properties of good liquid membrane and carriers are also discussed. Liquid membrane used in EME of non-polar basic drugs, polar basic drugs, non-polar acidic drugs, polar acidic drugs, small inorganic cations, small inorganic anions, amino acids and peptides are reviewed in this thesis. Physicochemical properties like charge of analytes, log P, pKa and EME recoveries of analytes are presented. Water solubility, boiling point, viscosity and vapor pressure of organic solvents used as LM are described. Organic solvents used in EME are pure solvents, mixture of solvents, pure solvents containing ionic carriers and mixtures of solvents with ionic carriers.