liquid-solid extraction stir-bar solid-phase extraction CHMO:0001591 SBSE The process of transferring a substance from a liquid to a solid phase by attaching a stationary phase to a stir bar which moves throughout the liquid sample. solid pahse stir bar extraction solid phase stir-bar extraction solid-phase stir bar extraction solid-phase stir-bar extraction stir bar extraction stir bar solid phase extraction stir bar solid-phase extraction stir bar sorptive extraction stir-bar solid phase extraction stir-bar sorptive extraction