additive matrix effect 

Synonyms: background interference, translational matrix effect
https://doi.org/10.1351/goldbook.08005
Matrix effect that is independent of the measured quantity value of the measurand.
Notes:
  1. An additive matrix effect affects the intercept, not the slope, of a linear calibration curve.
  2. The effect is sometimes termed "translational matrix effect" or "background interference".
Examples:
  1. An additive matrix effect that originates from a missing or flawed blank correction.
  2. The measurement of plutonium mass concentration using a K-edge densitometer in the presence of a uranium admixture. The presence of uranium causes a large additive matrix effect.
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 999 [Terms] [Paper]
Citation: 'additive 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.08005 RIS BibTex EndNote
Div. VTextXMLJSON