In elemental analysis equipment, the term purge and trap refers to a type of autosampler inlet that uses a purging and trapping mechanism to introduce the sample. Often used for gas chromatography, inlets that feature purge and trap technology have the ability to detect compounds at low parts per billion (ppb) levels. Thus, they are the preferred type of inlet for testing for volatile organic compounds (VOCs), dangerous gases that typically vaporize at room temperature.
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