Recovery rate

The recovery rate (WFR) is a technical term from analytical chemistry and describes a criterion for evaluating the quality of analytical or measuring processes.

It is the ratio of the amount of an analyte that is added to a sample before sample preparation and the amount of this analyte that is found as a measurement result. The value of the WFR is usually given in percent.

${\displaystyle WFR={\frac {x_{\text{ist}}}{x_{\text{soll}}}}}$

If the recovery rate of an analyte is 100%, there has been no loss of this analyte during the entire analytical process (as a result of individual process steps such as grinding , extraction , derivatisation , measurement ). If the recovery rate is lower (e.g. 70%), this is an indication of substance loss. The proportion of losses can be checked using additional internal standards or a recovery function. To do this, the procedure is repeated several times with different amounts of the analyte added ( standard addition procedure ).

Individual evidence

1. ↑ Chemgapedia: Glossary: ​​Recovery rate