Final answer:
Gas chromatography methods may require separate calibrations for each component in a mixture, depending on the goal of the analysis.
Step-by-step explanation:
Gas chromatography is commonly used for the separation and analysis of mixtures. When calibrating a gas chromatography method, there can be a difference between the calibration with the compounds mixture and the calibration for each separate component.
If the goal is to determine the composition of a mixture, it is necessary to calibrate using the compound mixture itself. This involves creating a calibration curve using known concentrations of the mixture. However, if the goal is to analyze the individual components of the mixture, it may be necessary to calibrate separately for each component.
In this case, individual calibration curves are created using known concentrations of each separate component. This is done to account for any differences in response factors between the components, which can affect the accuracy of the analysis.