This is defined as \[K = \frac{Q_{\text{T}}/Q_{\text{M}}}{Q_{\text{T}}^{\text{o}}/Q_{\text{M}}^{\text{o}}}\] where \(Q_{\text{T}}\) and \(Q_{\text{T}}^{\text{o}}\) are the quantities of the microcomponent in the concentrate and in the sample, respectively (mass units or concentration units), and \(Q_{\text{M}}^{\text{o}}\) and \(Q_{\text{M}}\) and are the quantities of the matrix before and after @[email protected], respectively. If the @[email protected] is 100%, \(K=\frac{Q_{\text{M}}^{\text{o}}}{Q_{\text{M}}}\). The terms enrichment @[email protected] and enrichment factor are not recommended.