A technique based on the different solubility of microcomponents in the liquid and solid matrix. It has a limited field of application for the analysis of fusible (and stable) substances.
Source:
PAC, 1979, 51, 1195. 'Separation and Preconcentration of Trace Substances. I-Preconcentration for Inorganic Trace Analysis' on page 1200 (https://doi.org/10.1351/pac197951051195)