Which statement about detector response factor usage in multi-analyte quantitation is true?

Which statement about detector response factor usage in multi-analyte quantitation is true?

• A. They eliminate the need for calibration.
• B. They adjust injection volume.
• C. They help compare responses of different analytes to a single reference signal, enabling accurate quantitation when detector responses vary among analytes.
• D. They are used only in GC, not LC-MS.

Answer: (C)

Detector response factors normalize different analyte signals to a common reference so you can quantify each compound accurately even when detector response varies among analytes. Different chemicals often produce different signal intensities at the same concentration because of varying ionization efficiencies or detector sensitivities. By measuring how strongly each analyte responds relative to a reference (from calibration data), you derive a response factor. Then, when analyzing unknown samples, you compare the analyte signal to the reference signal and apply the corresponding response factor to determine the concentration. This approach relies on calibration to establish the factors; it doesn’t eliminate calibration. It also doesn’t adjust injection volume. And it’s used in both GC and LC-MS, not just GC.

Detector response factors normalize different analyte signals to a common reference so you can quantify each compound accurately even when detector response varies among analytes. Different chemicals often produce different signal intensities at the same concentration because of varying ionization efficiencies or detector sensitivities. By measuring how strongly each analyte responds relative to a reference (from calibration data), you derive a response factor. Then, when analyzing unknown samples, you compare the analyte signal to the reference signal and apply the corresponding response factor to determine the concentration. This approach relies on calibration to establish the factors; it doesn’t eliminate calibration. It also doesn’t adjust injection volume. And it’s used in both GC and LC-MS, not just GC.