For example, mercury thermometers, slits in the tip of a pen, gaps between towels and blotter fibers, fine gaps in soil structures, and veins of roots, stems, and leaves of plants can be considered as capillaries. Capillary electrochromatography is a new type of micro-separation analysis technology developed in recent years. It combines the advantages of capillary electrophoresis and micro-diameter column chromatography by passing through the micro-diameter column of stainless steel capillary column packed with fine particle liquid chromatography. A DC high-voltage electric field is applied to achieve superior separation capability for trace complex biological and chemical system samples.
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