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The efficiencies of two narrow bore columns (100mm and 50mm×2.1mm) packed with 1.7μm totally porous BEH-C 18 particles were measured on two very high pressure liquid chromatographs (Acquity from Waters and 1290 Infinity HPLC System from Agilent) operating at maximum pressures of 1034 and 1200bar, respectively. The probe compounds were a mixture of uracil, acetophenone, toluene, and naphthalene...
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