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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Caption: Figure 1 - Percentage distribution of the soil phosphorus fractions extracted by Hedley's chemical fractionation from a Humic Cambisolols under successive cultivation of Pinus taeda in the 1st crop after 16 years (a) and in the 3rd crop with 17 years (b), both without fertilizer application for 16 and 49 years, respectively.
The inorganic P extracted with anion exchange resin ([Pi.sub.RTA]) and NaHC[O.sub.3] ([Pi.sub.bic]) and the organic P extracted with NaHC[O.sub.3] ([Po.sub.bic]) are the first extractants used in the chemical fractionation of P (Hedley et al., 1982).
Chemical fractionation showed that F1 and F2 fraction of the metals was near 1% and residual form was the dominant for Zn, Cu, and Pb in all samples.
Delgado A, Ruiz JR, del Campillo MC, Kassem S, Andreu L (2000) Calcium- and iron-related phosphorus in calcareous and calcareous marsh soils: Sequential chemical fractionation and [sup.31]P nuclear magnetic resonance study.
Comet water has twice the amount of deuterium that terrestrial water does (and deuterium is almost impossible to get rid of by chemical fractionation).
Ivanoff DB, Reddy KR, Robinson S (1998) Chemical fractionation of organic phosphorus in selected histosols.