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Split/Splitless Gas Chromatography Injection

split /SplitlessGasChromatographyInjectio nThomas G. ChasteenDepartment of ChemistrySam Houston State UniversitySee ~chemistry/primers/ for a PDF version of this diameter and chromatographic film amount of modern capillary gas chromatographic (GC) columnsdictates that the size of injected samples (the mass of analytes inject on-column) is relatively small compared topacked columns. For instance, packed columns can handle tenths of milligrams (100s of micrograms) example, analyte peaks A and B can be successfully separated with masses of 200 g A and 125 g B andstill get baseline separation (the chromatographer s holy grail). With packed columns this is all capillary columns are much more easily overloaded: A and B need to the 20 g and g at a maximumto be baseline separated if they re closely eluting (similar retention times). At masses much above this thechromatographic peaks are overloaded (see here) and overlap because all the chromatographic active sites in thecapillary column s chromatographic surface are filled and additional analyte is not retained, vastly broadeningthe peaks.

The diameter and chromatographic film amount of modern capillary gas chromatographic (GC) columns dictates that the size of injected samples (the mass of analytes inject on-column) is relatively small compared to packed columns. For instance, packed columns can handle tenths of milligrams (100s of micrograms) injected.

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