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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).

Bad news. So for trace analysis, splitless injection is used. Again, this is merely a flip of the switch. See below. In this mode all the analyte sample vaporized in the injector goes onto the column. This is called the splitless mode and it’s used for trace because all the analyte mass in a 1 µL injection goes on column, and is not split;

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