collection

https://doi.org/10.1351/goldbook.C01148
The planned removal from solution of a micro- or macro-component by the intentional formation of a contaminated host precipitate, or by the adsorption or entrapment of the component by an added solid.
Source:
Orange Book, 2nd ed., p. 84 (http://media.iupac.org/publications/analytical_compendium/)