fractionation

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fractionation

[‚frak·shə′nā·shən]
(chemistry)
Separation of a mixture in successive stages, each stage removing from the mixture some proportion of one of the substances, as by differential solubility in water-solvent mixtures.
(nucleonics)
Alterations in the isotopic composition of substances found in nature or in radioactive weapon debris, which result from small differences in the physical and chemical properties of isotopes of an element.
References in periodicals archive ?
Total and chemical fractionation (mg/kg) of heavy metals in soils and sewage sludge Extractant Cu Pb Zn Ni Collipulli KN[O.
To achieve this objective, we used a sequential chemical fractionation technique to fractionate Co and Mn in 18 different soils collected from sites throughout New Zealand.
Despite the cumulative errors common in chemical fractionations, the results show satisfactory agreement between the sum and total values for both soil Co and Mn.