Disadvantages

The rules for operation (e.g. injection speed, timing of heating and venting) are complicated and care is needed with timing of heating. Labile solutes, especially involatile materials requiring long transfer periods (high molecular weight triacylglycerols), are subject to thermal stress. The injector liner is too small for headspace samples. Transfer is by fractiona-tion and any slight change in split ratio will result in components of different volatility being split by different ratios, probably irreproducibly.

Because of the small volume of the insert, the conventional PTV injector could not originally double as a split - splitless injector; this has been overcome by the introduction of an injector incorporating innovative heating technology that enables the size of the PTV to be increased to that of conventional vaporizing injectors. This injector can also be used for analysis of gases and solids. If the liner is packed with an adsorbent it can be used, either in situ or temporarily removed from the injector, to adsorb volatile organic compounds.

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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