preconcentration coefficient of a desired microcomponentin trace analysis

This is defined as

$K = Q T Q M Q T o Q M o$

where $Q T$ and $Q T o$ are the quantities of the microcomponent in the concentrate and in the sample, respectively (mass units or concentration units), and $Q M o$ and $Q M$ and are the quantities of the matrix before and after preconcentration, respectively. If the recovery is 100%, $K = Q M o Q M$ . The terms enrichment coefficient and enrichment factor are not recommended.

Source:

PAC, 1979, 51, 1195 (Separation and preconcentration of trace substances. I - Preconcentration for inorganic trace analysis) on page 1198