Disclosed is a method for detecting a change in weight by means of an impedance-scanning quartz crystal microbalance that can be coupled to an evaluation device. The quartz crystal microbalance is designed to transmit the measurement points recorded at a predetermined data recording rate as raw data to the evaluation device. Said method comprises at least the following steps: the measurement points of the raw data are linearly adjusted to a fractional-rational function; and at least one resonant frequency is determined from the adjusted measurement points of the raw data, a change in the at least one resonant frequency corresponding to an effective change in weight.
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