Offline versus Online Arrangements

It is also necessary to differentiate between offline and online arrangements (Table 2). In the offline mode the reactions occur away from the high performance liquid chromatography (HPLC) system, although there may be some examples that could be defined as either offline or online (e.g. in a sample vial in a carousel as part of an automated derivatization-injec-tion system in LC). In the online mode the reaction chemistry occurs as part of the HPLC system, integrated into the instrumentation and analysis, and is time constrained and controlled. Thus there are four different and distinct types of derivatization approaches, or modes, for LC: (1) online, pre-column; (2) online, post-column; (3) offline, pre-column; and (4) offline, post-column (Table 2).

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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