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An apparatus including a rotary‐type injector was designed for quantitative sample injection in capillary electrophoresis (CE), in which both pressurized flow and electroosmotic flow were used to drive the background electrolyte solution. A relative standard deviation of peak area of lower than 1% was achieved by using this apparatus. The effects of back‐pressure regulator, restrictor, and applied voltage on separation efficiency and resolution were investigated. The utility of this apparatus in both micro‐HPLC and pressurized capillary electrochromatography (pCEC) was also demonstrated.
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Yao et al. (2003) studied this question.
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