multiplicative matrix effect 

https://doi.org/10.1351/goldbook.08035
Matrix effect that is proportional to the measured quantity value of the measurand.
Notes:
  1. A multiplicative matrix effect can be compensated for by following a measurement procedure with standard addition.
  2. A multiplicative matrix effect affects the slope, not the intercept, of a linear calibration curve.
  3. The effect is sometimes termed "rotational matrix effect" or "proportional interference".
  4. A multiplicative matrix effect may originate from non-analyte components of the measurement standard if these contribute to the signal attributed to the analyte.
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1013 [Terms] [Paper]
Citation: 'multiplicative matrix effect' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08035 RIS BibTex EndNote
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