Measured quantity value relating a component to a system divided by a reference value.
Notes: - The quantities involved are rational unitary quantities and of the same kind of quantity, usually either a concentration or content.
- The respective measurement procedure must be specified.
- The definition can be symbolized by \(R_{\rm{B}} = Q_{\rm{B,measured}}/Q_{\rm{B,reference}}\), where \(R\) denotes the recovered ratio of the quantity values \(Q\), and \(\ce{B}\) identifies the component.
- The term "recovery" is also used to describe material recovery. Therefore, the term "recovery" should not be used without qualification unless the meaning is clear from the context.
- Recovery quantity value ratio is used in procedure validation to evaluate and correct for the measurement procedure bias.
- Recovered quantity value ratio may be estimated from the measured change of the quantity value of the component of interest upon the addition of a known amount of substance or mass of the component. The added material containing the component is often termed "spike". See also: blank material Note 5, measurement procedure with standard addition, and spike.
Source:
PAC, 2021, 93, 997. 'Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)' on page 1014 (https://doi.org/10.1515/pac-2019-0819)