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Chromatographs

About Chromatographs

Chromatographs are used to perform chromatographic separation and produce chromatograms. Chromatography separates complex mixtures of chemicals or proteins into their various constituents. A chromatograph takes a chemical mixture carried by a liquid or gas and separates it into its component parts as a result of the differential distribution of the solutes as they flow around or over a stationary liquid or solid phase. The basic principal of chromatographs is that when a stream of chemical compounds flows over a surface that attracts some of the compounds more than others, the less strongly attracted compounds move faster than the compounds that stick more tightly to the surface, and the mixture becomes separated. Most chromatographs consist of five different parts: the mobile phase supply system, the injection or sampling system, the column and column oven, the detector, and the data acquisition and data processing system.

There are two basic types of chromatographs: liquid chromatographs and gas chromatographs. A liquid chromatograph is used to separate ions or molecules that are dissolved in a solvent. If a sample solution contacts a second solid or liquid phase, the different solutes interact with the other phase to differing degrees due to differences in adsorption, ion-exchange, partitioning, or size. These differences allow the mixture components to be separated by using the differences to determine the transit time of the solutes through a column. A gas chromatograph can be used to identify air pollutants or chemicals based on volatility and/or evaporation. For example, researchers in the fragrance industry can use a gas chromatograph mass spectrometer to identify the chemicals that make up a particular odor or taste. The gas chromatograph separates the chemical mixture into pulses of pure chemicals. The mass spectrometer identifies and quantifies the chemicals.

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Part Numbers for Chromatographs

Part # Distributor Manufacturer Product Category Description
06711685 Amazon Restek BISS Restek Replacement Chemical Traps For Agilent Gas Chromatographs; For: Agilent 5890 GCs
06712056 Amazon Restek BISS Restek Replacement Chemical Traps For Agilent Gas Chromatographs; For: Agilent 6890/6850 GCs
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