Question

In gas chromatography the concentration of a substance can be determined by

Answer 1

In gas chromatography the concentration of a substance can be determined by

❱ In gas chromatography, the concentration of a substance can be determined by measurement of the height of the peak produced by the substance.

Answer 2

By comparing the area under the peak produced by a substance with the areas under the peaks produced by standard solutions, one can calculate the concentration of a substance using gas chromatography.

• An analytical technique known as gas chromatography (GC) is used to identify, separate, and quantify the chemical components of a sample mixture. Typically, these chemical components are gases or organic molecules.
• The value can be compared to values obtained by running standard solutions through the column using the area under a peak. Keep in mind that peak area matters more than peak height. It is the type of substance, not its concentration, that is determined by Rt values.
• If used correctly, GC can measure parts-per-billion concentrations in gaseous samples or picomoles of a substance in a 1 ml liquid sample.
• The general formula for a response factor in GC is the peak area divided by the chemical component's concentration.
• Sometimes the peak's height is employed in place of the area. The result of dividing one response factor by another is the relative response factor (RRF).

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