this invention refers to a microsplitter in flow systems especially used for separation techniques in analytical chemistry such as microliquid chromatography , high pressure liquid chromatography and ancillary techniques . the splitter system comprises a microsplitter and a micromixer which are connected by a microbore tubing . a high collection rate and high resolution of the sample peak are achieved by the proper choice of tubing length and diameters and the use of a back pressure regulator to obtain a controlled split ratio .