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I. INTRODUCTION
High resolution liquid chromatography (LC) is a relatively new analytical technique which has experienced an enormous increase in research activity during the last 10 years. The reason that this method, the discovery of which preceded gas chromatography (GC) by many years, was not used extensively until relatively recently was due to the lack of suitable hardware needed to accomplish fast and efficient separations. The development of sophisticated LC instrumentation during recent years, however, has made LC a powerful complement to GC.