The ability of an analytical method to assess small variations of the concentration of an analyte,and that is often expressed as the slope of the calibration curve,is referred to as:

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Analytical sensitivity is the ability of a method to detect small variations in analyte concentration. This is typically measured as the slope of the calibration curve, which describes the relationship between the concentration of the analyte and the response of the method. The steeper the slope, the more sensitive the method is, as it can differentiate smaller differences in concentration.

The Ability of an Analytical Method to Assess Small Variations