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How do chromatogram peak height and peak area help measure concentration?
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In chromatography, both peak height and peak area serve as quantitative measures to determine the concentration of a substance within an analyte.12
Quantitative Analysis
To determine concentration, analysts typically create a working curve by plotting the peak height or peak area of a series of known standards against their respective concentrations. Once this curve is established, the concentration of an unknown component can be calculated by measuring its corresponding peak height or area on the chromatogram and referencing the curve.2
Peak Area vs. Peak Height
- Peak Area: This is generally proportional to the total amount of solute producing the peak. Modern electronic integrators calculate this by summing signal intensities over the duration of the peak, often adjusting for detector response factors to ensure accuracy.1
- Peak Height: This is frequently used as a quantitative measure for narrow peaks where determining the area accurately is difficult.1
When using these metrics, it is essential to account for the detector's sensitivity and linear range, as different solutes may produce varying signal intensities depending on their chemical properties.3