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Chromatography columns fabricated by coating their inner walls with a thin film of liquid as the stationary phase. Most capillary columns use fused-silica, stainless steel, or glass tubes of 0.2 to 0.6 mm in inner diameter and 10 to 150 m in length. Capillary columns are very efficient but have a relatively low sample capacity. These columns are used in systems that use gas as the mobile phase (gas chromatography systems).
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