has participant liquid-solid extraction stir-bar solid-phase extraction 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. stir bar solid-phase extraction solid pahse stir bar extraction solid-phase stir bar extraction stir bar sorptive extraction stir-bar solid phase extraction CHMO:0001591 stir bar extraction stir bar solid phase extraction solid phase stir-bar extraction stir-bar sorptive extraction solid-phase stir-bar extraction SBSE stir bar