TITLE

Establishment of signal-recovery functions for calculation of recovery factor. Application to monitoring of contaminant residues in vegetables by chemiluminescence detection

AUTHOR(S)
Gámiz-Gracia, Laura; Cuadros-Rodríguez, Luis; Soto-Chinchilla, Jorge J.; Huertas-Pérez, José F.; González-Casado, Antonio; García-Campaña, Ana M.
PUB. DATE
December 2005
SOURCE
Analytical & Bioanalytical Chemistry;Dec2005, Vol. 384 Issue 1, p295
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new strategy is proposed for verifying if recovery factor is constant and independent of the real analyte content of samples. A signal-recovery function has been developed on the basis of measurement of spiked test samples before and after a pre-treatment step and considering, as starting point, a recent IUPAC recommendation which distinguishes between two terms—recovery factor, R, and apparent recovery, R*. Apparent recovery includes recovery factor and a new recovery term proposed in a previous paper by the authors, named calibration recovery, R C. The signal-recovery function is obtained directly from the measured analytical signals instead of from the concentrations, simplifying the calculations. A linear signal-recovery curve indicates that the recovery factor is constant in the analyte concentration range studied experimentally and, in this way, a single recovery factor can be calculated. The usefulness of the proposed method has been shown by quantification of the pesticide carbaryl by two different flow-injection analysis methods with chemiluminescent detection based on the luminol and TCPO systems. Good results were obtained from both methods.
ACCESSION #
19203938

 

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