1. Apportionment of a solute between two phases. The terms parttion or extraction may also be used in this sense were appropriate.
2. Dispersal of a substance and its derivatives throughout the natural environment or throughout an organism.
3. Final location(s) of a substance within an organism after dispersal.

The term "distribution" was found in the following pages:

Mercury 'speciation analysis' by using thermal desorption analysis | EVISA's News
Instrument database: Edax Inc. - Eagle III ÁProbe
Incorporation of rare earth elements in the shell of freshwater mussels as an indicator for their bioavailability from polluted river water | EVISA's News
Cadmium in chocolate: New EU regulation enter into force 1 January 2019 | EVISA's News
Instrument database: Lauda Dr. R. Wobser GmbH & Co. KG - LAUDA Aqualine AL 12 Heated water bath
Journals database: Bulletin of Glaciological Research
Instrument database: PerkinElmer Inc. - Spectrum Spotlight 200 FTIR Microscope System
Visualizing the bioaccumulation of arsenic in a fern | EVISA's News
Company database: Astoria-Pacific International
ICHMET 2020: 20th International Conference on Heavy Metals in the Environment | EVISA's Agenda of Events
Journals database: Food Technology in New Zealand
Journals database: Arzneimittel Forschung - Drug Research
Instrument database: Zinsser Analytic GmbH - OYSTER BAY - Professional Plate Coating Systems
Instrument database: Bruker Nano GmbH - M4 Tornado
Stability of Reference Materials for Speciation Analysis | EVISA's News
Company database: University of Chicago Press
Instrument database: Kore Technology - MS-200 Portable Mass Spectrometer
Company database: Julabo Labortechnik GmbH
Instrument database: Milestone S.r.l. - ETHOS SEL High Performance Extraction System
Journals database: Journal of the Illuminating Engineering Society